chore: librarian release pull request: 20260121T162706Z

[daniel-sanche]

PR created by the Librarian CLI to initialize a release. Merging this PR will auto trigger a release.

Librarian Version: v1.0.1
Language Image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:b8058df4c45e9a6e07f6b4d65b458d0d059241dd34c814f151c8bf6b89211209

google-auth: 2.48.0

2.48.0 (2026-01-21)

Features

• honor NO_GCE_CHECK environment variable (feat: honor NO_GCE_CHECK environment variable #1610) (383c9827)

• add configurable GCE Metadata Server retries (feat: add configurable GCE Metadata Server retries #1488) (454b441b)

• add cryptography as required dependency (feat: add cryptography as required dependency #1929) (52558ae2)

• Support the mTLS IAM domain for Certificate based Access (feat(iam): Support the mTLS IAM domain for Certificate based Access #1938) (8dcf91a1)

Bug Fixes

• resolve circular imports (fix: resolve circular imports #1942) (25c1b064)

• Use user_verification=preferred for ReAuth WebAuthn challenge (fix: Use user_verification=preferred for ReAuth WebAuthn challenge #1798) (3f88a240)

• removes content-header from AWS IMDS get request (fix: removes content-header from AWS IMDS get request #1934) (97bfea9e)

• detect correct auth when ADC env var is set but empty (fix: detect correct auth when ADC env var is set but empty #1374) (bfc07e10)

• replace deprecated utcfromtimestamp (fix: replace deprecated utcfromtimestamp #1799) (e431f20c)

[gemini-code-assist]

Summary of Changes

Hello @daniel-sanche, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request is an automated release for the google-auth library, advancing its version to 2.48.0. The update incorporates several new features that enhance authentication mechanisms and includes a suite of bug fixes to improve stability and correctness across various authentication flows and environments.

Highlights

• Version Update: The google-auth library has been updated to version 2.48.0.
• New Features: Introduced support for honoring the NO_GCE_CHECK environment variable, configurable GCE Metadata Server retries, and mTLS IAM domain for Certificate based Access. The cryptography library is now a required dependency.
• Bug Fixes: Addressed issues including circular imports, incorrect user_verification for ReAuth WebAuthn challenge, removal of content-header from AWS IMDS get requests, improved detection of auth when ADC env var is empty, and replacement of the deprecated utcfromtimestamp.

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[gemini-code-assist]

Code Review

This pull request is an automated release PR for version 2.48.0 of google-auth. The changes include updating the version in .librarian/state.yaml and google/auth/version.py, and adding a new entry to CHANGELOG.md. The changes are appropriate for a release. I've added one comment to improve the consistency of the changelog.

[gemini-code-assist]

The order of items in the Features and Bug Fixes sections is different from the order in the pull request description. For consistency and easier cross-referencing, it would be best if these lists matched.

Suggested change

	* add cryptography as required dependency (#1929) ([52558ae2881b1e6555f6f5c0d76365c15807ead9](https://github.com/googleapis/google-auth-library-python/commit/52558ae2881b1e6555f6f5c0d76365c15807ead9))
	* Support the mTLS IAM domain for Certificate based Access (#1938) ([8dcf91a1b05c85fbbd0bcee78d66e498099102ab](https://github.com/googleapis/google-auth-library-python/commit/8dcf91a1b05c85fbbd0bcee78d66e498099102ab))
	* add configurable GCE Metadata Server retries (#1488) ([454b441b478ec62bbf1a6ad5bceb6c7cbbfd0c37](https://github.com/googleapis/google-auth-library-python/commit/454b441b478ec62bbf1a6ad5bceb6c7cbbfd0c37))
	* honor `NO_GCE_CHECK` environment variable (#1610) ([383c9827536d9376e8248370ce4c2b83e468d027](https://github.com/googleapis/google-auth-library-python/commit/383c9827536d9376e8248370ce4c2b83e468d027))
	### Bug Fixes
	* resolve circular imports (#1942) ([25c1b064545702cbef087cfcd15fbbb6ef1af74f](https://github.com/googleapis/google-auth-library-python/commit/25c1b064545702cbef087cfcd15fbbb6ef1af74f))
	* removes `content-header` from AWS IMDS get request (#1934) ([97bfea9e02ede953fc8ee154e0deed3a3cfc6dcc](https://github.com/googleapis/google-auth-library-python/commit/97bfea9e02ede953fc8ee154e0deed3a3cfc6dcc))
	* detect correct auth when ADC env var is set but empty (#1374) ([bfc07e1050bd0aa86fa3b08cdf70c9b68b5fe6a2](https://github.com/googleapis/google-auth-library-python/commit/bfc07e1050bd0aa86fa3b08cdf70c9b68b5fe6a2))
	* replace deprecated utcfromtimestamp (#1799) ([e431f20cf73ccac71926a23ec454468cea92e053](https://github.com/googleapis/google-auth-library-python/commit/e431f20cf73ccac71926a23ec454468cea92e053))
	* Use `user_verification=preferred` for ReAuth WebAuthn challenge (#1798) ([3f88a24089c4ee6822d510de0db210b54260d873](https://github.com/googleapis/google-auth-library-python/commit/3f88a24089c4ee6822d510de0db210b54260d873))
	* honor `NO_GCE_CHECK` environment variable (#1610) ([383c9827536d9376e8248370ce4c2b83e468d027](https://github.com/googleapis/google-auth-library-python/commit/383c9827536d9376e8248370ce4c2b83e468d027))
	* add configurable GCE Metadata Server retries (#1488) ([454b441b478ec62bbf1a6ad5bceb6c7cbbfd0c37](https://github.com/googleapis/google-auth-library-python/commit/454b441b478ec62bbf1a6ad5bceb6c7cbbfd0c37))
	* add cryptography as required dependency (#1929) ([52558ae2881b1e6555f6f5c0d76365c15807ead9](https://github.com/googleapis/google-auth-library-python/commit/52558ae2881b1e6555f6f5c0d76365c15807ead9))
	* Support the mTLS IAM domain for Certificate based Access (#1938) ([8dcf91a1b05c85fbbd0bcee78d66e498099102ab](https://github.com/googleapis/google-auth-library-python/commit/8dcf91a1b05c85fbbd0bcee78d66e498099102ab))
	### Bug Fixes
	* resolve circular imports (#1942) ([25c1b064545702cbef087cfcd15fbbb6ef1af74f](https://github.com/googleapis/google-auth-library-python/commit/25c1b064545702cbef087cfcd15fbbb6ef1af74f))
	* Use `user_verification=preferred` for ReAuth WebAuthn challenge (#1798) ([3f88a24089c4ee6822d510de0db210b54260d873](https://github.com/googleapis/google-auth-library-python/commit/3f88a24089c4ee6822d510de0db210b54260d873))
	* removes `content-header` from AWS IMDS get request (#1934) ([97bfea9e02ede953fc8ee154e0deed3a3cfc6dcc](https://github.com/googleapis/google-auth-library-python/commit/97bfea9e02ede953fc8ee154e0deed3a3cfc6dcc))
	* detect correct auth when ADC env var is set but empty (#1374) ([bfc07e1050bd0aa86fa3b08cdf70c9b68b5fe6a2](https://github.com/googleapis/google-auth-library-python/commit/bfc07e1050bd0aa86fa3b08cdf70c9b68b5fe6a2))
	* replace deprecated utcfromtimestamp (#1799) ([e431f20cf73ccac71926a23ec454468cea92e053](https://github.com/googleapis/google-auth-library-python/commit/e431f20cf73ccac71926a23ec454468cea92e053))