Description
lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. Unless an algorithm is specified in a jwt.decode call, HMAC verification is allowed with any asymmetric public key. (This is similar to CVE-2022-29217 and CVE-2024-33663.)
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-authlib | 1.3.1-1 | — |
| Debian 13 | python-authlib | 1.3.1-1 | — |
| Debian 12 | python-authlib | 1.2.0-1+deb12u1 | — |
| Debian 11 | python-authlib | 0.15.4-1+deb11u1 | DLA-4352-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | python-authlib | No fix yet | — |
| Ubuntu 25.10 | python-authlib | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | python-authlib | 1.3.0-1ubuntu0.1~esm1 | USN-8065-1 |
| Ubuntu Pro 22.04 LTS | python-authlib | 0.15.5-1ubuntu0.1~esm1 | USN-8065-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 3 | python-Authlib | 1.3.1-150600.3.3.1 | SUSE-SU-2024:2064-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-Authlib | 1.3.1-1.1 | openSUSE-SU-2026:11614-1, openSUSE-SU-2024:14035-1 |
| openSUSE Leap 15.6 | python-Authlib | 1.3.1-150600.3.3.1 | SUSE-SU-2024:2064-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | authlib | < 1.3.1 | 1.3.1 | GHSA-5357-c2jx-v7qh |
Advisories 5
- openSUSE-SU-2026:11614-1 python313-Authlib-1.7.2-3.1 on GA media SUSE / openSUSE Security Updates · Aug 27, 2026
- USN-8065-1 python-authlib vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2024:2064-1 Security update for python-Authlib SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14035-1 python310-Authlib-1.3.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- DLA-4352-1 python-authlib - security update Debian Security (DSA / DLA) · Oct 29, 2025