chore(deps): update module github.com/sigstore/fulcio to v1.8.6 [security] (alauda-v0.34.0) - #183
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ℹ Artifact update noticeFile name: go.modIn order to perform the update(s) described in the table above, Renovate ran the
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This PR contains the following updates:
v1.8.5->v1.8.6Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage in github.com/sigstore/fulcio
CVE-2026-49478 / GHSA-f5mr-q85p-6hh6 / GO-2026-5853
More information
Details
Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage in github.com/sigstore/fulcio
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage
CVE-2026-49478 / GHSA-f5mr-q85p-6hh6 / GO-2026-5853
More information
Details
Impact
Three security vulnerabilities were identified in the OIDC Discovery client:
Blind Server-Side Request Forgery (SSRF) via Cross-Host Redirects:
Fulcio uses an HTTP client to fetch OIDC discovery metadata (
/.well-known/openid-configuration). Prior to this fix, if a configured issuer returned an HTTP redirect to a different host, the client followed it by default. This allowed a compromised or malicious issuer to redirect Fulcio's discovery requests to internal-only systems, resulting in blind SSRF.JWKS Substitution and Cache Poisoning:
Because cross-host redirects were permitted during OIDC discovery, an attacker could manipulate the discovery flow to return a malicious
jwks_uripointing to an attacker-controlled host. When Fulcio successfully initialized the provider and cached the resulting verifier in the verifier cache, it poisoned the cache with the attacker's verification keys. The attacker could then present signatures validated against the poisoned keys.Kubernetes ServiceAccount Token Leakage:
Fulcio mounts an in-cluster Kubernetes ServiceAccount token to authenticate OIDC discovery requests sent to the local control plane API server (
https://kubernetes.default.svc).jwks_uripointed to a different domain.MetaIssuerof typekubernetes(e.g., matching external EKS/GKE endpoints) was matched, and a local Kubernetes issuer was present in the config, the transport loaded and attached the local in-cluster ServiceAccount token to outbound requests sent to the external host.Patches
The following mitigations have been applied:
https://kubernetes.default.svc).Workarounds
None, upgrade to v1.8.6
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
sigstore/fulcio (github.com/sigstore/fulcio)
v1.8.6Compare Source
Features
Configuration
📅 Schedule: Branch creation - "" in timezone Asia/Shanghai, Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
This PR has been generated by Renovate Bot.