CVE catalog
CVE-2026-28490
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning
- Severity
- High · CVSS 8.3
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.14% · Oct 25, 2026
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-authlib | sid | 1.7.2-2 | fixed |
| Debian | python-authlib | forky | 1.7.2-2 | fixed |
| Debian | python-authlib | trixie | 1.6.0-1+deb13u1 | vulnerable |
| Debian | python-authlib | bookworm | 1.2.0-1+deb12u1 | vulnerable |
| Debian | python-authlib | bookworm-security | 1.2.0-1+deb12u2 | fixed |
| Pip | authlib | Not reported | 1.6.9 | fixed |
| Cpe | python-authlib | Not reported | Not reported | vulnerable |
| Cpe | python-authlib | Not reported | 1.3.0-1ubuntu0.1~esm2 | fixed |
| Cpe | python-authlib-doc | Not reported | 1.3.0-1ubuntu0.1~esm2 | fixed |
| Cpe | python3-authlib | Not reported | 1.3.0-1ubuntu0.1~esm2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-authlib | source | sid | 1.6.9-1 | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | forky | 1.6.9-1 | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | bookworm | 1.2.0-1+deb12u2 | not yet assigned | Not reported | Not reported |
| Pip | authlib | pip | Not reported | 1.6.9 | Not reported | Not reported | Not reported |
| Cpe | python-authlib | cpe | Not reported | 1.3.0-1ubuntu0.1~esm2 | Not reported | Not reported | Not reported |
| Cpe | python-authlib-doc | cpe | Not reported | 1.3.0-1ubuntu0.1~esm2 | Not reported | Not reported | Not reported |
| Cpe | python3-authlib | cpe | Not reported | 1.3.0-1ubuntu0.1~esm2 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-authlib]Affected
Source package: [python-authlib]
Details (4)
1.2.0-1+deb12u1· all · bookwormAffected · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
1.2.0-1+deb12u1· all · bookwormAffected · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
- [python-authlib-doc]Affected
Source package: [python-authlib]
Details (4)
1.2.0-1+deb12u1· all · bookwormAffected · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
1.2.0-1+deb12u1· all · bookwormAffected · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
1.2.0-1+deb12u2· all · bookworm-securityFixed · Fixed:
1.2.0-1+deb12u2nvd · python-authlib · debian · bookworm; nvd · python-authlib · debian · 12
[Debian 13 (Trixie)]
- [python3-authlib]Affected
Source package: [python-authlib]
Details (2)
1.6.0-1+deb13u1· all · trixieAffected
nvd · python-authlib · debian · 13
1.6.0-1+deb13u1· all · trixieAffected
nvd · python-authlib · debian · 13
- [python-authlib-doc]Affected
Source package: [python-authlib]
Details (2)
1.6.0-1+deb13u1· all · trixieAffected
nvd · python-authlib · debian · 13
1.6.0-1+deb13u1· all · trixieAffected
nvd · python-authlib · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_20392-1.json]
- [https://github.com/advisories/GHSA-7432-952r-cw78]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-28490]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-28490]
- [https://security-tracker.debian.org/tracker/CVE-2026-28490]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28490.json]
- [https://ubuntu.com/security/notices/USN-8557-1]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]