CVE-2025-62706 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2025-62706 Interim 1 2 2025-12-23T00:15:51Z current 2025-11-01T00:14:39Z 2025-12-23T00:15:51Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2025-62706 Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib's JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the application boundary, forking and add a bounded decompression guard via decompressobj().decompress(data, MAX_SIZE)) and returning an error when output exceeds a safe limit, or enforcing strict maximum token sizes and fail fast on oversized inputs; combine with rate limiting. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://lists.suse.com/pipermail/sle-security-updates/2025-October/023078.html E-Mail link for SUSE-SU-2025:3842-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings SUSE Linux Enterprise Module for Python 3 15 SP6 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP6 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP6 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP6 SUSE Linux Enterprise Module for Python 3 15 SP7 openSUSE Leap 15.6 python311-Authlib-1.3.1-150600.3.9.1 python311-Authlib-1.3.1-150600.3.9.1 as a component of SUSE Linux Enterprise Module for Python 3 15 SP6 python311-Authlib-1.3.1-150600.3.9.1 as a component of SUSE Linux Enterprise Module for Python 3 15 SP7 python311-Authlib-1.3.1-150600.3.9.1 as a component of openSUSE Leap 15.6 Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib's JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the application boundary, forking and add a bounded decompression guard via decompressobj().decompress(data, MAX_SIZE)) and returning an error when output exceeds a safe limit, or enforcing strict maximum token sizes and fail fast on oversized inputs; combine with rate limiting. CVE-2025-62706 SUSE Linux Enterprise Module for Python 3 15 SP6:python311-Authlib-1.3.1-150600.3.9.1 SUSE Linux Enterprise Module for Python 3 15 SP7:python311-Authlib-1.3.1-150600.3.9.1 openSUSE Leap 15.6:python311-Authlib-1.3.1-150600.3.9.1 moderate 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H