CVE catalog
CVE-2026-85394
python-jose through 3.5.0 fails to properly validate asymmetric keys in HMAC initialization, accepting DER-encoded public keys that lack PEM armor or SSH prefixes. Attackers holding the service's publ
- Severity
- Critical · CVSS 9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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 - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.22% · Oct 25, 2026
python-jose through 3.5.0 fails to properly validate asymmetric keys in HMAC initialization, accepting DER-encoded public keys that lack PEM armor or SSH prefixes. Attackers holding the service's public key can forge HS256 tokens that pass verification when algorithms are not explicitly restricted. This is an incomplete fix for CVE-2024-33663.
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-jose | bookworm | 3.3.0+dfsg-4 | not affected |
| Pip | python-jose | Not reported | Not reported | unknown |
| Ubuntu | python-jose | 22.04 | 3.3.0+dfsg-1 | vulnerable |
| Ubuntu | python-jose | 24.04 | 3.3.0+dfsg-4 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-jose | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-jose]Not affected
Source package: [python-jose]
Details (2)
3.3.0+dfsg-4· all · bookwormNot affected
nvd · python-jose · debian · bookworm
3.3.0+dfsg-4· all · bookwormNot affected
nvd · python-jose · debian · bookworm
- [python-jose-doc]Not affected
Source package: [python-jose]
Details (2)
3.3.0+dfsg-4· all · bookwormNot affected
nvd · python-jose · debian · bookworm
3.3.0+dfsg-4· all · bookwormNot affected
nvd · python-jose · debian · bookworm
Observed:
References
- [https://github.com/advisories/GHSA-3qf3-8w2g-rqmx]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-85394]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-85394]
- [https://security-tracker.debian.org/tracker/CVE-2026-85394]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85394.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]