CVE catalog
CVE-2026-75509
UBUNTU-CVE-2026-75509
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.12% · Oct 25, 2026
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to version 1.7.3, JWTClaimsRegistry applies membership matching to list-valued iss and sub claims, allowing an array-valued iss that contains the expected issuer to pass an intended equality check and enabling issuer-validation bypass. This issue is fixed in version 1.7.3.
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 | joserfc | 13 | 1.1.0-1 | vulnerable |
| Debian | joserfc | 13 | 1.2.0-1 | vulnerable |
| Debian | joserfc | 13 | 1.2.2-1 | vulnerable |
| Debian | joserfc | 13 | 1.3.1-1 | vulnerable |
| Debian | joserfc | 13 | 1.3.2-1 | vulnerable |
| Debian | joserfc | 13 | 1.3.4-1 | vulnerable |
| Debian | joserfc | 13 | 1.4.0-1 | vulnerable |
| Debian | joserfc | 13 | 1.4.1-1 | vulnerable |
| Debian | joserfc | 13 | 1.4.3-1 | vulnerable |
| Debian | joserfc | 13 | 1.5.0-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.0-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.1-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.2-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.3-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.4-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.5-1 | vulnerable |
| Debian | joserfc | 13 | 1.6.8-1 | vulnerable |
| Debian | joserfc | 13 | 1.7.0-1 | vulnerable |
| Debian | joserfc | 13 | 1.7.1-1 | vulnerable |
| Debian | joserfc | 13 | 1.7.2-1 | vulnerable |
| Debian | joserfc | 13 | 1.7.3-1 | vulnerable |
| Debian | joserfc | 13 | 1.7.4-1 | vulnerable |
| Debian | joserfc | 13 | 1.7.5-1 | vulnerable |
| Debian | joserfc | 14 | 1.1.0-1 | vulnerable |
| Debian | joserfc | 14 | 1.2.0-1 | vulnerable |
| Debian | joserfc | 14 | 1.2.2-1 | vulnerable |
| Debian | joserfc | 14 | 1.3.1-1 | vulnerable |
| Debian | joserfc | 14 | 1.3.2-1 | vulnerable |
| Debian | joserfc | 14 | 1.3.4-1 | vulnerable |
| Debian | joserfc | 14 | 1.4.0-1 | vulnerable |
| Debian | joserfc | 14 | 1.4.1-1 | vulnerable |
| Debian | joserfc | 14 | 1.4.3-1 | vulnerable |
| Debian | joserfc | 14 | 1.5.0-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.0-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.1-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.2-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.3-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.4-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.5-1 | vulnerable |
| Debian | joserfc | 14 | 1.6.8-1 | vulnerable |
| Debian | joserfc | 14 | 1.7.0-1 | vulnerable |
| Debian | joserfc | 14 | 1.7.1-1 | vulnerable |
| Debian | joserfc | 14 | 1.7.2-1 | vulnerable |
| Debian | joserfc | 14 | 1.7.3-1 | fixed |
| Ubuntu | joserfc | 26.04 | 1.2.2-1 | vulnerable |
| Ubuntu | joserfc | 26.04 | 1.4.0-1 | vulnerable |
| Ubuntu | joserfc | 26.04 | 1.4.1-1 | vulnerable |
| Ubuntu | joserfc | 26.04 | 1.4.3-1 | vulnerable |
| Ubuntu | joserfc | 26.04 | 1.5.0-1 | vulnerable |
| Ubuntu | joserfc | 26.04 | 1.6.2-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | joserfc | deb | 14 | 1.7.3-1 | Not reported | DEBIAN-CVE-2026-75509 | Not reported |
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [python3-joserfc]Affected
Source package: [joserfc]
Details (2)
1.1.0-1· all · trixieAffected
pypi · joserfc · debian · 13
1.1.0-1· all · trixieAffected
pypi · joserfc · debian · 13
Observed: