csaf_suse - suse-su-2025:3754-1

SUSE-SU-2025:3754-1

Vulnerability from csaf_suse - Published: 2025-10-23 10:27 - Updated: 2025-10-23 10:27

Summary

Security update for python-Authlib

Notes

Title of the patch

Security update for python-Authlib

Description of the patch

This update for python-Authlib fixes the following issues: - CVE-2025-61920: limited the size of the header to prevent DoS (bsc#1251921).

Patchnames

SUSE-2025-3754,SUSE-SLE-Module-Python3-15-SP6-2025-3754,SUSE-SLE-Module-Python3-15-SP7-2025-3754,openSUSE-SLE-15.6-2025-3754

CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).

JSON

To clipboard

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CVE-2025-61920 (GCVE-0-2025-61920)

Vulnerability from cvelistv5 – Published: 2025-10-10 19:25 – Updated: 2025-11-03 17:45

Summary

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url‑encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving CPU and memory consumption to hostile levels and enabling denial of service. Version 1.6.5 patches the issue. Some temporary workarounds are available. Enforce input size limits before handing tokens to Authlib and/or use application-level throttling to reduce amplification risk.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-20 - Improper Input Validation
CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

	https://github.com/authlib/authlib/security/advis…	x_refsource_CONFIRM
	https://github.com/authlib/authlib/commit/867e3f8…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	authlib	authlib	Affected: < 1.6.5

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

SUSE-SU-2025:3754-1

CVE-2025-61920 (GCVE-0-2025-61920)

Tags

Sightings

Nomenclature