CVE catalog
CVE-2026-28802
Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empt
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.50% · Oct 25, 2026
Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.
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 | not affected |
| Debian | python-authlib | bookworm-security | 1.2.0-1+deb12u2 | not affected |
| Pip | authlib | Not reported | 1.6.7 | fixed |
| Cpe | authlib | Not reported | 1.6.7 | fixed |
| Ubuntu | python-authlib | 25.10 | 1.5.1-1 | vulnerable |
| Ubuntu | python-authlib | 25.10 | 1.5.2-1 | vulnerable |
| Ubuntu | python-authlib | 25.10 | 1.6.0-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-authlib | source | sid | 1.6.7-1 | not yet assigned | Not reported | Not reported |
| Debian | python-authlib | source | forky | 1.6.7-1 | 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 | Not affected | unimportant | Not reported | Not reported |
| Pip | authlib | pip | Not reported | 1.6.7 | Not reported | Not reported | Not reported |
| Cpe | authlib | cpe | Not reported | 1.6.7 | Not reported | NVD-CVE-2026-28802 | Not reported |
OpenFactory catalog packages
[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
[Debian 12 (Bookworm)]
- [python3-authlib]Not affected
Source package: [python-authlib]
Details (4)
1.2.0-1+deb12u1· all · bookwormNot affected
nvd · python-authlib · debian · bookworm
1.2.0-1+deb12u1· all · bookwormNot affected
nvd · python-authlib · debian · bookworm
1.2.0-1+deb12u2· all · bookworm-securityNot affected
nvd · python-authlib · debian · bookworm
1.2.0-1+deb12u2· all · bookworm-securityNot affected
nvd · python-authlib · debian · bookworm
- [python-authlib-doc]Not affected
Source package: [python-authlib]
Details (4)
1.2.0-1+deb12u1· all · bookwormNot affected
nvd · python-authlib · debian · bookworm
1.2.0-1+deb12u1· all · bookwormNot affected
nvd · python-authlib · debian · bookworm
1.2.0-1+deb12u2· all · bookworm-securityNot affected
nvd · python-authlib · debian · bookworm
1.2.0-1+deb12u2· all · bookworm-securityNot affected
nvd · python-authlib · debian · bookworm
Observed:
References
- [https://github.com/advisories/GHSA-7wc2-qxgw-g8gg]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-28802]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-28802]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-28802]
- [https://security-tracker.debian.org/tracker/CVE-2026-28802]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28802.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0935.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]