SUSE Python-Authlib Critical Issues Fix Advisory 2026-0975-1
suse
March 24, 2026
An update that solves three vulnerabilities can now be installed.
Summary
## This update for python-Authlib fixes the following issues: * CVE-2026-27962: JWS `deserialize_compact()` allows for signature bypass by accepting user-controlled embedded JWK as verification key (bsc#1259738). * CVE-2026-28490: cryptographic padding oracle in JWE RSA1_5 key management algorithm (bsc#1259736). * CVE-2026-28498: fail-open in behavior OIDC hash validation allows for bypass mandatory integrity protections (bsc#1259737). ## Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: * openSUSE Leap 15.6 zypper in -t patch SUSE-2026-975=1 openSUSE-SLE-15.6-2026-975=1 * Python 3 Module 15-SP7
Topics Covered
References
* bsc#1259736
* bsc#1259737
* bsc#1259738
Cross-
* CVE-2026-27962
* CVE-2026-28490
* CVE-2026-28498
CVSS scores:
* CVE-2026-27962 ( SUSE ): 9.1
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
* CVE-2026-27962 ( SUSE ): 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-27962 ( NVD ): 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
* CVE-2026-28490 ( SUSE ): 8.2
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
* CVE-2026-28490 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
* CVE-2026-28490 ( NVD ): 8.3
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Announcement ID: SUSE-SU-2026:0975-1
Release Date: 2026-03-23T16:34:44Z
Rating: critical
Topics Covered
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