From 6c269e22379d24e4e40df60ce060402ce7fc3bdf Mon Sep 17 00:00:00 2001
From: icanhasmath <marcg@activestate.com>
Date: Thu, 6 Aug 2026 14:58:54 -0500
Subject: [PATCH 1/2] Fix CVE-2024-3651: quadratic joining-type scan in
 idna.encode()

GHSA-jjg7-2v4v-x38h. A specially crafted argument to idna.encode() could
consume an exceptional amount of CPU: a short label of n CONTEXTJ joiners
cost O(n^2) work, so a few kilobytes of input stalled the process. Measured
on this branch before the fix: 250 joiners 0.04s, 500 0.16s, 1000 0.56s,
2000 2.09s, 4000 8.43s -- 4x per doubling. After: constant, 0.0001s.

RFC 5892 Appendix A.1 requires a ZERO WIDTH NON-JOINER to match

  (Joining_Type:{L,D})(Joining_Type:T)*ZWNJ(Joining_Type:T)*(Joining_Type:{R,D})

so the scan on each side of the joiner must stop at the first codepoint that
is neither Transparent nor a valid terminator. valid_contextj() instead fell
through on anything that was not Transparent and not L/D (resp. R/D) and kept
scanning to the end of the label. That was both the performance bug and a
correctness bug: labels with a Non_Joining codepoint between the joiner and
its context were wrongly accepted.

Two changes are required together, mirroring upstream:

1. idna/core.py -- add the `else: break` arm to both scan loops in
   valid_contextj(), so a non-Transparent, non-terminating joining type ends
   the search.

2. idna/idnadata.py -- regenerate `joining_types`. This is not optional. The
   table was built from ArabicShaping.txt, which lists joining types only for
   the Arabic script, so it held just 4 Transparent entries out of 775. With
   only (1) applied, every combining mark would terminate the scan and valid
   IDNs would be rejected. The table is now derived from
   extracted/DerivedJoiningType.txt: 2722 entries (T=1997, D=586, R=130, L=5,
   C=4).

   Regenerated at Unicode 13.0.0, the version idna 2.10's other tables are
   built on, rather than lifting upstream 3.7's Unicode 15.1.0 table, so the
   release stays internally consistent. Verified to reproduce every one of
   2.10's existing D/R/L/C entries exactly (586/130/5/4, no diffs). The 46
   explicit Non_Joining (U) entries are dropped, matching upstream: with the
   `else: break` arm an absent entry and an explicit U now behave identically.

3. tools/idna-data -- point _load_arabicshaping() at
   extracted/DerivedJoiningType.txt and handle its range syntax, so the
   committed table is reproducible from the generator.

Validation under Python 2.7.18: the full IdnaTest.txt conformance corpus runs
7787 tests with 1227 pre-existing skips, identical to the pristine 2.10 base --
no behavioural drift. Two regression tests added; both fail on the pristine
base and pass with the fix.

Upstream fix: kjd/idna commit 5beb28b9dd77 (PR #172), released in idna 3.7.
Advisory: https://github.com/kjd/idna/security/advisories/GHSA-jjg7-2v4v-x38h
          https://nvd.nist.gov/vuln/detail/CVE-2024-3651

Py2.7 notes: test literals use \uXXXX escapes so tests/test_idna.py stays pure
ASCII and needs no PEP 263 coding declaration; assertIsNone/assertLess are both
available in 2.7's unittest.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 idna/core.py       |    8 +-
 idna/idnadata.py   | 2039 +++++++++++++++++++++++++++++++++++++++++++-
 tests/test_idna.py |   53 ++
 tools/idna-data    |   13 +-
 4 files changed, 2062 insertions(+), 51 deletions(-)

diff --git a/idna/core.py b/idna/core.py
index 41ec5c7..cd4a446 100644
--- a/idna/core.py
+++ b/idna/core.py
@@ -161,9 +161,11 @@ def valid_contextj(label, pos):
             joining_type = idnadata.joining_types.get(ord(label[i]))
             if joining_type == ord('T'):
                 continue
-            if joining_type in [ord('L'), ord('D')]:
+            elif joining_type in [ord('L'), ord('D')]:
                 ok = True
                 break
+            else:
+                break
 
         if not ok:
             return False
@@ -173,9 +175,11 @@ def valid_contextj(label, pos):
             joining_type = idnadata.joining_types.get(ord(label[i]))
             if joining_type == ord('T'):
                 continue
-            if joining_type in [ord('R'), ord('D')]:
+            elif joining_type in [ord('R'), ord('D')]:
                 ok = True
                 break
+            else:
+                break
         return ok
 
     if cp_value == 0x200d:
diff --git a/idna/idnadata.py b/idna/idnadata.py
index a284e4c..092af58 100644
--- a/idna/idnadata.py
+++ b/idna/idnadata.py
@@ -92,16 +92,190 @@
     ),
 }
 joining_types = {
-    0x600: 85,
-    0x601: 85,
-    0x602: 85,
-    0x603: 85,
-    0x604: 85,
-    0x605: 85,
-    0x608: 85,
-    0x60b: 85,
+    0xad: 84,
+    0x300: 84,
+    0x301: 84,
+    0x302: 84,
+    0x303: 84,
+    0x304: 84,
+    0x305: 84,
+    0x306: 84,
+    0x307: 84,
+    0x308: 84,
+    0x309: 84,
+    0x30a: 84,
+    0x30b: 84,
+    0x30c: 84,
+    0x30d: 84,
+    0x30e: 84,
+    0x30f: 84,
+    0x310: 84,
+    0x311: 84,
+    0x312: 84,
+    0x313: 84,
+    0x314: 84,
+    0x315: 84,
+    0x316: 84,
+    0x317: 84,
+    0x318: 84,
+    0x319: 84,
+    0x31a: 84,
+    0x31b: 84,
+    0x31c: 84,
+    0x31d: 84,
+    0x31e: 84,
+    0x31f: 84,
+    0x320: 84,
+    0x321: 84,
+    0x322: 84,
+    0x323: 84,
+    0x324: 84,
+    0x325: 84,
+    0x326: 84,
+    0x327: 84,
+    0x328: 84,
+    0x329: 84,
+    0x32a: 84,
+    0x32b: 84,
+    0x32c: 84,
+    0x32d: 84,
+    0x32e: 84,
+    0x32f: 84,
+    0x330: 84,
+    0x331: 84,
+    0x332: 84,
+    0x333: 84,
+    0x334: 84,
+    0x335: 84,
+    0x336: 84,
+    0x337: 84,
+    0x338: 84,
+    0x339: 84,
+    0x33a: 84,
+    0x33b: 84,
+    0x33c: 84,
+    0x33d: 84,
+    0x33e: 84,
+    0x33f: 84,
+    0x340: 84,
+    0x341: 84,
+    0x342: 84,
+    0x343: 84,
+    0x344: 84,
+    0x345: 84,
+    0x346: 84,
+    0x347: 84,
+    0x348: 84,
+    0x349: 84,
+    0x34a: 84,
+    0x34b: 84,
+    0x34c: 84,
+    0x34d: 84,
+    0x34e: 84,
+    0x34f: 84,
+    0x350: 84,
+    0x351: 84,
+    0x352: 84,
+    0x353: 84,
+    0x354: 84,
+    0x355: 84,
+    0x356: 84,
+    0x357: 84,
+    0x358: 84,
+    0x359: 84,
+    0x35a: 84,
+    0x35b: 84,
+    0x35c: 84,
+    0x35d: 84,
+    0x35e: 84,
+    0x35f: 84,
+    0x360: 84,
+    0x361: 84,
+    0x362: 84,
+    0x363: 84,
+    0x364: 84,
+    0x365: 84,
+    0x366: 84,
+    0x367: 84,
+    0x368: 84,
+    0x369: 84,
+    0x36a: 84,
+    0x36b: 84,
+    0x36c: 84,
+    0x36d: 84,
+    0x36e: 84,
+    0x36f: 84,
+    0x483: 84,
+    0x484: 84,
+    0x485: 84,
+    0x486: 84,
+    0x487: 84,
+    0x488: 84,
+    0x489: 84,
+    0x591: 84,
+    0x592: 84,
+    0x593: 84,
+    0x594: 84,
+    0x595: 84,
+    0x596: 84,
+    0x597: 84,
+    0x598: 84,
+    0x599: 84,
+    0x59a: 84,
+    0x59b: 84,
+    0x59c: 84,
+    0x59d: 84,
+    0x59e: 84,
+    0x59f: 84,
+    0x5a0: 84,
+    0x5a1: 84,
+    0x5a2: 84,
+    0x5a3: 84,
+    0x5a4: 84,
+    0x5a5: 84,
+    0x5a6: 84,
+    0x5a7: 84,
+    0x5a8: 84,
+    0x5a9: 84,
+    0x5aa: 84,
+    0x5ab: 84,
+    0x5ac: 84,
+    0x5ad: 84,
+    0x5ae: 84,
+    0x5af: 84,
+    0x5b0: 84,
+    0x5b1: 84,
+    0x5b2: 84,
+    0x5b3: 84,
+    0x5b4: 84,
+    0x5b5: 84,
+    0x5b6: 84,
+    0x5b7: 84,
+    0x5b8: 84,
+    0x5b9: 84,
+    0x5ba: 84,
+    0x5bb: 84,
+    0x5bc: 84,
+    0x5bd: 84,
+    0x5bf: 84,
+    0x5c1: 84,
+    0x5c2: 84,
+    0x5c4: 84,
+    0x5c5: 84,
+    0x5c7: 84,
+    0x610: 84,
+    0x611: 84,
+    0x612: 84,
+    0x613: 84,
+    0x614: 84,
+    0x615: 84,
+    0x616: 84,
+    0x617: 84,
+    0x618: 84,
+    0x619: 84,
+    0x61a: 84,
+    0x61c: 84,
     0x620: 68,
-    0x621: 85,
     0x622: 82,
     0x623: 82,
     0x624: 82,
@@ -143,12 +317,33 @@
     0x648: 82,
     0x649: 68,
     0x64a: 68,
+    0x64b: 84,
+    0x64c: 84,
+    0x64d: 84,
+    0x64e: 84,
+    0x64f: 84,
+    0x650: 84,
+    0x651: 84,
+    0x652: 84,
+    0x653: 84,
+    0x654: 84,
+    0x655: 84,
+    0x656: 84,
+    0x657: 84,
+    0x658: 84,
+    0x659: 84,
+    0x65a: 84,
+    0x65b: 84,
+    0x65c: 84,
+    0x65d: 84,
+    0x65e: 84,
+    0x65f: 84,
     0x66e: 68,
     0x66f: 68,
+    0x670: 84,
     0x671: 82,
     0x672: 82,
     0x673: 82,
-    0x674: 85,
     0x675: 82,
     0x676: 82,
     0x677: 82,
@@ -245,7 +440,25 @@
     0x6d2: 82,
     0x6d3: 82,
     0x6d5: 82,
-    0x6dd: 85,
+    0x6d6: 84,
+    0x6d7: 84,
+    0x6d8: 84,
+    0x6d9: 84,
+    0x6da: 84,
+    0x6db: 84,
+    0x6dc: 84,
+    0x6df: 84,
+    0x6e0: 84,
+    0x6e1: 84,
+    0x6e2: 84,
+    0x6e3: 84,
+    0x6e4: 84,
+    0x6e7: 84,
+    0x6e8: 84,
+    0x6ea: 84,
+    0x6eb: 84,
+    0x6ec: 84,
+    0x6ed: 84,
     0x6ee: 82,
     0x6ef: 82,
     0x6fa: 68,
@@ -254,6 +467,7 @@
     0x6ff: 68,
     0x70f: 84,
     0x710: 82,
+    0x711: 84,
     0x712: 68,
     0x713: 68,
     0x714: 68,
@@ -284,6 +498,33 @@
     0x72d: 68,
     0x72e: 68,
     0x72f: 82,
+    0x730: 84,
+    0x731: 84,
+    0x732: 84,
+    0x733: 84,
+    0x734: 84,
+    0x735: 84,
+    0x736: 84,
+    0x737: 84,
+    0x738: 84,
+    0x739: 84,
+    0x73a: 84,
+    0x73b: 84,
+    0x73c: 84,
+    0x73d: 84,
+    0x73e: 84,
+    0x73f: 84,
+    0x740: 84,
+    0x741: 84,
+    0x742: 84,
+    0x743: 84,
+    0x744: 84,
+    0x745: 84,
+    0x746: 84,
+    0x747: 84,
+    0x748: 84,
+    0x749: 84,
+    0x74a: 84,
     0x74d: 82,
     0x74e: 68,
     0x74f: 68,
@@ -335,6 +576,17 @@
     0x77d: 68,
     0x77e: 68,
     0x77f: 68,
+    0x7a6: 84,
+    0x7a7: 84,
+    0x7a8: 84,
+    0x7a9: 84,
+    0x7aa: 84,
+    0x7ab: 84,
+    0x7ac: 84,
+    0x7ad: 84,
+    0x7ae: 84,
+    0x7af: 84,
+    0x7b0: 84,
     0x7ca: 68,
     0x7cb: 68,
     0x7cc: 68,
@@ -368,7 +620,38 @@
     0x7e8: 68,
     0x7e9: 68,
     0x7ea: 68,
+    0x7eb: 84,
+    0x7ec: 84,
+    0x7ed: 84,
+    0x7ee: 84,
+    0x7ef: 84,
+    0x7f0: 84,
+    0x7f1: 84,
+    0x7f2: 84,
+    0x7f3: 84,
     0x7fa: 67,
+    0x7fd: 84,
+    0x816: 84,
+    0x817: 84,
+    0x818: 84,
+    0x819: 84,
+    0x81b: 84,
+    0x81c: 84,
+    0x81d: 84,
+    0x81e: 84,
+    0x81f: 84,
+    0x820: 84,
+    0x821: 84,
+    0x822: 84,
+    0x823: 84,
+    0x825: 84,
+    0x826: 84,
+    0x827: 84,
+    0x829: 84,
+    0x82a: 84,
+    0x82b: 84,
+    0x82c: 84,
+    0x82d: 84,
     0x840: 82,
     0x841: 68,
     0x842: 68,
@@ -394,13 +677,14 @@
     0x856: 82,
     0x857: 82,
     0x858: 82,
+    0x859: 84,
+    0x85a: 84,
+    0x85b: 84,
     0x860: 68,
-    0x861: 85,
     0x862: 68,
     0x863: 68,
     0x864: 68,
     0x865: 68,
-    0x866: 85,
     0x867: 82,
     0x868: 68,
     0x869: 82,
@@ -418,7 +702,6 @@
     0x8aa: 82,
     0x8ab: 82,
     0x8ac: 82,
-    0x8ad: 85,
     0x8ae: 82,
     0x8af: 68,
     0x8b0: 68,
@@ -444,11 +727,346 @@
     0x8c5: 68,
     0x8c6: 68,
     0x8c7: 68,
-    0x8e2: 85,
-    0x1806: 85,
+    0x8d3: 84,
+    0x8d4: 84,
+    0x8d5: 84,
+    0x8d6: 84,
+    0x8d7: 84,
+    0x8d8: 84,
+    0x8d9: 84,
+    0x8da: 84,
+    0x8db: 84,
+    0x8dc: 84,
+    0x8dd: 84,
+    0x8de: 84,
+    0x8df: 84,
+    0x8e0: 84,
+    0x8e1: 84,
+    0x8e3: 84,
+    0x8e4: 84,
+    0x8e5: 84,
+    0x8e6: 84,
+    0x8e7: 84,
+    0x8e8: 84,
+    0x8e9: 84,
+    0x8ea: 84,
+    0x8eb: 84,
+    0x8ec: 84,
+    0x8ed: 84,
+    0x8ee: 84,
+    0x8ef: 84,
+    0x8f0: 84,
+    0x8f1: 84,
+    0x8f2: 84,
+    0x8f3: 84,
+    0x8f4: 84,
+    0x8f5: 84,
+    0x8f6: 84,
+    0x8f7: 84,
+    0x8f8: 84,
+    0x8f9: 84,
+    0x8fa: 84,
+    0x8fb: 84,
+    0x8fc: 84,
+    0x8fd: 84,
+    0x8fe: 84,
+    0x8ff: 84,
+    0x900: 84,
+    0x901: 84,
+    0x902: 84,
+    0x93a: 84,
+    0x93c: 84,
+    0x941: 84,
+    0x942: 84,
+    0x943: 84,
+    0x944: 84,
+    0x945: 84,
+    0x946: 84,
+    0x947: 84,
+    0x948: 84,
+    0x94d: 84,
+    0x951: 84,
+    0x952: 84,
+    0x953: 84,
+    0x954: 84,
+    0x955: 84,
+    0x956: 84,
+    0x957: 84,
+    0x962: 84,
+    0x963: 84,
+    0x981: 84,
+    0x9bc: 84,
+    0x9c1: 84,
+    0x9c2: 84,
+    0x9c3: 84,
+    0x9c4: 84,
+    0x9cd: 84,
+    0x9e2: 84,
+    0x9e3: 84,
+    0x9fe: 84,
+    0xa01: 84,
+    0xa02: 84,
+    0xa3c: 84,
+    0xa41: 84,
+    0xa42: 84,
+    0xa47: 84,
+    0xa48: 84,
+    0xa4b: 84,
+    0xa4c: 84,
+    0xa4d: 84,
+    0xa51: 84,
+    0xa70: 84,
+    0xa71: 84,
+    0xa75: 84,
+    0xa81: 84,
+    0xa82: 84,
+    0xabc: 84,
+    0xac1: 84,
+    0xac2: 84,
+    0xac3: 84,
+    0xac4: 84,
+    0xac5: 84,
+    0xac7: 84,
+    0xac8: 84,
+    0xacd: 84,
+    0xae2: 84,
+    0xae3: 84,
+    0xafa: 84,
+    0xafb: 84,
+    0xafc: 84,
+    0xafd: 84,
+    0xafe: 84,
+    0xaff: 84,
+    0xb01: 84,
+    0xb3c: 84,
+    0xb3f: 84,
+    0xb41: 84,
+    0xb42: 84,
+    0xb43: 84,
+    0xb44: 84,
+    0xb4d: 84,
+    0xb55: 84,
+    0xb56: 84,
+    0xb62: 84,
+    0xb63: 84,
+    0xb82: 84,
+    0xbc0: 84,
+    0xbcd: 84,
+    0xc00: 84,
+    0xc04: 84,
+    0xc3e: 84,
+    0xc3f: 84,
+    0xc40: 84,
+    0xc46: 84,
+    0xc47: 84,
+    0xc48: 84,
+    0xc4a: 84,
+    0xc4b: 84,
+    0xc4c: 84,
+    0xc4d: 84,
+    0xc55: 84,
+    0xc56: 84,
+    0xc62: 84,
+    0xc63: 84,
+    0xc81: 84,
+    0xcbc: 84,
+    0xcbf: 84,
+    0xcc6: 84,
+    0xccc: 84,
+    0xccd: 84,
+    0xce2: 84,
+    0xce3: 84,
+    0xd00: 84,
+    0xd01: 84,
+    0xd3b: 84,
+    0xd3c: 84,
+    0xd41: 84,
+    0xd42: 84,
+    0xd43: 84,
+    0xd44: 84,
+    0xd4d: 84,
+    0xd62: 84,
+    0xd63: 84,
+    0xd81: 84,
+    0xdca: 84,
+    0xdd2: 84,
+    0xdd3: 84,
+    0xdd4: 84,
+    0xdd6: 84,
+    0xe31: 84,
+    0xe34: 84,
+    0xe35: 84,
+    0xe36: 84,
+    0xe37: 84,
+    0xe38: 84,
+    0xe39: 84,
+    0xe3a: 84,
+    0xe47: 84,
+    0xe48: 84,
+    0xe49: 84,
+    0xe4a: 84,
+    0xe4b: 84,
+    0xe4c: 84,
+    0xe4d: 84,
+    0xe4e: 84,
+    0xeb1: 84,
+    0xeb4: 84,
+    0xeb5: 84,
+    0xeb6: 84,
+    0xeb7: 84,
+    0xeb8: 84,
+    0xeb9: 84,
+    0xeba: 84,
+    0xebb: 84,
+    0xebc: 84,
+    0xec8: 84,
+    0xec9: 84,
+    0xeca: 84,
+    0xecb: 84,
+    0xecc: 84,
+    0xecd: 84,
+    0xf18: 84,
+    0xf19: 84,
+    0xf35: 84,
+    0xf37: 84,
+    0xf39: 84,
+    0xf71: 84,
+    0xf72: 84,
+    0xf73: 84,
+    0xf74: 84,
+    0xf75: 84,
+    0xf76: 84,
+    0xf77: 84,
+    0xf78: 84,
+    0xf79: 84,
+    0xf7a: 84,
+    0xf7b: 84,
+    0xf7c: 84,
+    0xf7d: 84,
+    0xf7e: 84,
+    0xf80: 84,
+    0xf81: 84,
+    0xf82: 84,
+    0xf83: 84,
+    0xf84: 84,
+    0xf86: 84,
+    0xf87: 84,
+    0xf8d: 84,
+    0xf8e: 84,
+    0xf8f: 84,
+    0xf90: 84,
+    0xf91: 84,
+    0xf92: 84,
+    0xf93: 84,
+    0xf94: 84,
+    0xf95: 84,
+    0xf96: 84,
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+    0xe013b: 84,
+    0xe013c: 84,
+    0xe013d: 84,
+    0xe013e: 84,
+    0xe013f: 84,
+    0xe0140: 84,
+    0xe0141: 84,
+    0xe0142: 84,
+    0xe0143: 84,
+    0xe0144: 84,
+    0xe0145: 84,
+    0xe0146: 84,
+    0xe0147: 84,
+    0xe0148: 84,
+    0xe0149: 84,
+    0xe014a: 84,
+    0xe014b: 84,
+    0xe014c: 84,
+    0xe014d: 84,
+    0xe014e: 84,
+    0xe014f: 84,
+    0xe0150: 84,
+    0xe0151: 84,
+    0xe0152: 84,
+    0xe0153: 84,
+    0xe0154: 84,
+    0xe0155: 84,
+    0xe0156: 84,
+    0xe0157: 84,
+    0xe0158: 84,
+    0xe0159: 84,
+    0xe015a: 84,
+    0xe015b: 84,
+    0xe015c: 84,
+    0xe015d: 84,
+    0xe015e: 84,
+    0xe015f: 84,
+    0xe0160: 84,
+    0xe0161: 84,
+    0xe0162: 84,
+    0xe0163: 84,
+    0xe0164: 84,
+    0xe0165: 84,
+    0xe0166: 84,
+    0xe0167: 84,
+    0xe0168: 84,
+    0xe0169: 84,
+    0xe016a: 84,
+    0xe016b: 84,
+    0xe016c: 84,
+    0xe016d: 84,
+    0xe016e: 84,
+    0xe016f: 84,
+    0xe0170: 84,
+    0xe0171: 84,
+    0xe0172: 84,
+    0xe0173: 84,
+    0xe0174: 84,
+    0xe0175: 84,
+    0xe0176: 84,
+    0xe0177: 84,
+    0xe0178: 84,
+    0xe0179: 84,
+    0xe017a: 84,
+    0xe017b: 84,
+    0xe017c: 84,
+    0xe017d: 84,
+    0xe017e: 84,
+    0xe017f: 84,
+    0xe0180: 84,
+    0xe0181: 84,
+    0xe0182: 84,
+    0xe0183: 84,
+    0xe0184: 84,
+    0xe0185: 84,
+    0xe0186: 84,
+    0xe0187: 84,
+    0xe0188: 84,
+    0xe0189: 84,
+    0xe018a: 84,
+    0xe018b: 84,
+    0xe018c: 84,
+    0xe018d: 84,
+    0xe018e: 84,
+    0xe018f: 84,
+    0xe0190: 84,
+    0xe0191: 84,
+    0xe0192: 84,
+    0xe0193: 84,
+    0xe0194: 84,
+    0xe0195: 84,
+    0xe0196: 84,
+    0xe0197: 84,
+    0xe0198: 84,
+    0xe0199: 84,
+    0xe019a: 84,
+    0xe019b: 84,
+    0xe019c: 84,
+    0xe019d: 84,
+    0xe019e: 84,
+    0xe019f: 84,
+    0xe01a0: 84,
+    0xe01a1: 84,
+    0xe01a2: 84,
+    0xe01a3: 84,
+    0xe01a4: 84,
+    0xe01a5: 84,
+    0xe01a6: 84,
+    0xe01a7: 84,
+    0xe01a8: 84,
+    0xe01a9: 84,
+    0xe01aa: 84,
+    0xe01ab: 84,
+    0xe01ac: 84,
+    0xe01ad: 84,
+    0xe01ae: 84,
+    0xe01af: 84,
+    0xe01b0: 84,
+    0xe01b1: 84,
+    0xe01b2: 84,
+    0xe01b3: 84,
+    0xe01b4: 84,
+    0xe01b5: 84,
+    0xe01b6: 84,
+    0xe01b7: 84,
+    0xe01b8: 84,
+    0xe01b9: 84,
+    0xe01ba: 84,
+    0xe01bb: 84,
+    0xe01bc: 84,
+    0xe01bd: 84,
+    0xe01be: 84,
+    0xe01bf: 84,
+    0xe01c0: 84,
+    0xe01c1: 84,
+    0xe01c2: 84,
+    0xe01c3: 84,
+    0xe01c4: 84,
+    0xe01c5: 84,
+    0xe01c6: 84,
+    0xe01c7: 84,
+    0xe01c8: 84,
+    0xe01c9: 84,
+    0xe01ca: 84,
+    0xe01cb: 84,
+    0xe01cc: 84,
+    0xe01cd: 84,
+    0xe01ce: 84,
+    0xe01cf: 84,
+    0xe01d0: 84,
+    0xe01d1: 84,
+    0xe01d2: 84,
+    0xe01d3: 84,
+    0xe01d4: 84,
+    0xe01d5: 84,
+    0xe01d6: 84,
+    0xe01d7: 84,
+    0xe01d8: 84,
+    0xe01d9: 84,
+    0xe01da: 84,
+    0xe01db: 84,
+    0xe01dc: 84,
+    0xe01dd: 84,
+    0xe01de: 84,
+    0xe01df: 84,
+    0xe01e0: 84,
+    0xe01e1: 84,
+    0xe01e2: 84,
+    0xe01e3: 84,
+    0xe01e4: 84,
+    0xe01e5: 84,
+    0xe01e6: 84,
+    0xe01e7: 84,
+    0xe01e8: 84,
+    0xe01e9: 84,
+    0xe01ea: 84,
+    0xe01eb: 84,
+    0xe01ec: 84,
+    0xe01ed: 84,
+    0xe01ee: 84,
+    0xe01ef: 84,
 }
 codepoint_classes = {
     'PVALID': (
diff --git a/tests/test_idna.py b/tests/test_idna.py
index 2d8c450..121517c 100755
--- a/tests/test_idna.py
+++ b/tests/test_idna.py
@@ -1,8 +1,10 @@
 #!/usr/bin/env python
 
+import time
 import unittest
 
 import idna
+from idna import idnadata
 
 
 class IDNATests(unittest.TestCase):
@@ -177,6 +179,57 @@ def test_valid_contextj(self):
         self.assertFalse(idna.valid_contextj(latin + zwj, 1)) # No preceding Virama
         self.assertTrue(idna.valid_contextj(virama + zwj, 1)) # Preceding Virama
 
+    def test_valid_contextj_joining_type_scan(self):
+
+        # CVE-2024-3651.  RFC 5892 Appendix A.1 requires a ZWNJ to match
+        #   (Joining_Type:{L,D})(Joining_Type:T)*ZWNJ(Joining_Type:T)*(Joining_Type:{R,D})
+        # so the scan either side of the joiner must stop at the first codepoint
+        # whose joining type is neither Transparent nor a valid terminator.
+
+        zwnj = u'\u200c'
+        beh = u'\u0628'    # ARABIC LETTER BEH, Joining_Type=D
+        hamza = u'\u0621'  # ARABIC LETTER HAMZA, Joining_Type=U (Non_Joining)
+        fatha = u'\u064e'  # ARABIC FATHA, Joining_Type=T (Transparent)
+
+        # A Transparent codepoint between the joiner and its context is skipped.
+        self.assertTrue(idna.valid_contextj(beh + fatha + zwnj + fatha + beh, 2))
+
+        # A Non_Joining codepoint terminates the scan, so the label is invalid.
+        self.assertFalse(idna.valid_contextj(beh + hamza + zwnj + beh, 2))
+        self.assertFalse(idna.valid_contextj(beh + zwnj + hamza + beh, 1))
+
+        # Codepoints absent from the joining_types table default to Non_Joining
+        # and must terminate the scan the same way.
+        latin_a = u'a'
+        self.assertIsNone(idnadata.joining_types.get(ord(latin_a)))
+        self.assertFalse(idna.valid_contextj(beh + latin_a + zwnj + beh, 2))
+
+    def test_valid_contextj_is_not_quadratic(self):
+
+        # CVE-2024-3651.  Before the fix the scan fell through on unknown and
+        # Non_Joining codepoints instead of stopping, so a label of n joiners
+        # cost O(n^2) and idna.encode() could be stalled with a short string.
+        # Guard against the regression by comparing growth, not wall clock.
+
+        def elapsed(n):
+            label = u'\u0628' + (u'\u0621\u200c' * n) + u'\u0628'
+            start = time.time()
+            try:
+                idna.encode(label + u'.com')
+            except idna.IDNAError:
+                pass
+            return time.time() - start
+
+        small = elapsed(250)
+        large = elapsed(2000)
+
+        # An 8x longer label went from ~64x the work to ~8x at worst. Allow a
+        # very loose bound so the test is not flaky on a loaded machine, but
+        # still fails decisively on quadratic behaviour (which was ~50x here).
+        self.assertLess(large, max(small, 0.01) * 20,
+                        'valid_contextj scan appears quadratic: '
+                        '250 joiners took %.4fs, 2000 took %.4fs' % (small, large))
+
     def test_valid_contexto(self):
 
         latin = u'\u0061'
diff --git a/tools/idna-data b/tools/idna-data
index 8f1695b..29073e2 100755
--- a/tools/idna-data
+++ b/tools/idna-data
@@ -238,11 +238,18 @@ class UnicodeData(object):
     def _load_arabicshaping(self):
 
         self.ucd_as = {}
-        f_as = self._ucdfile('ArabicShaping.txt')
+        f_as = self._ucdfile('extracted/DerivedJoiningType.txt')
         for line in f_as.splitlines():
-            result = re.match('^(?P<cp>[0-9A-F]{4,6})\s*;\s*.*?\s*;\s*(?P<jt>\S+)\s*;', line)
+            result = re.match(
+                '^(?P<start>[0-9A-F]{4,6})(|\.\.(?P<end>[0-9A-F]{4,6}))\s*;\s*(?P<jt>\S+)\s*(|\#.*)$',
+                line)
             if result:
-                self.ucd_as[int(result.group('cp'), 16)] = result.group('jt')
+                if result.group('end'):
+                    for i in hexrange(result.group('start'), result.group('end')):
+                        self.ucd_as[i] = result.group('jt')
+                else:
+                    i = hexvalue(result.group('start'))
+                    self.ucd_as[i] = result.group('jt')
 
     def _load_scripts(self):
 

From 38cf5dccffbcc205b9d13f6b70c3547777ddb2a2 Mon Sep 17 00:00:00 2001
From: icanhasmath <marcg@activestate.com>
Date: Thu, 6 Aug 2026 15:13:12 -0500
Subject: [PATCH 2/2] Release 2.10.post1: idna security release

ActiveState security release of idna 2.10, the last upstream release to
support Python 2.7, carrying the backport of CVE-2024-3651
(GHSA-jjg7-2v4v-x38h), fixed upstream in idna 3.7.

Bumps idna/package_data.py __version__ to '2.10.post1' (the sole version
location in this tree; setup.py reads it from package_data) and adds a
HISTORY.rst entry in the file's existing plain-prose style.

Verified PEP 440: 2.10.post1 is a post-release, sorts after 2.10 and
before 2.11.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
---
 HISTORY.rst          | 12 ++++++++++++
 idna/package_data.py |  3 +--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 6a2db70..a22b989 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -3,6 +3,18 @@
 History
 -------
 
+2.10.post1 (2026-08-06)
++++++++++++++++++++++++
+
+- ActiveState security release. Fix CVE-2024-3651 (GHSA-jjg7-2v4v-x38h):
+  specially crafted input to idna.encode() could consume an exceptional
+  amount of CPU because the joining-type scan in valid_contextj() was
+  quadratic in the label length. Labels containing a Non_Joining codepoint
+  between a joiner and its context were also wrongly accepted, contrary to
+  RFC 5892 Appendix A.1. Backported from upstream idna 3.7; the
+  joining_types table is regenerated from Unicode 13.0.0
+  extracted/DerivedJoiningType.txt.
+
 2.10 (2020-06-27)
 +++++++++++++++++
 
diff --git a/idna/package_data.py b/idna/package_data.py
index ce1c521..f039324 100644
--- a/idna/package_data.py
+++ b/idna/package_data.py
@@ -1,2 +1 @@
-__version__ = '2.10'
-
+__version__ = '2.10.post1'