rfc3161-client has insufficient verification for timestamp response signatures
Impact
rfc3161-client 1.0.2 and earlier contain a flaw in their timestamp response signature verification logic. In particular, it performs chain verification against the TSR's embedded certificates up to the trusted root(s), but fails to verify the TSR's own signature against the timestamping leaf certificates. Consequently, vulnerable versions perform insufficient signature validation to properly consider a TSR verified, as the attacker can introduce any TSR signature so long as the embedded leaf chains up to some root TSA.
Patches
Users should immediately upgrade to rfc3161-client 1.0.3 or later.
Workarounds
There is no workaround possible. Users should immediately upgrade to a fixed version.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | rfc3161-client | < 1.0.3 | 1.0.3 |
Referencias
- https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-6qhv-4h7r-2g9m
- https://nvd.nist.gov/vuln/detail/CVE-2025-52556
- https://github.com/trailofbits/rfc3161-client/commit/724a184f953e3f171f85cb223871172b41b0d0dc
- https://github.com/trailofbits/rfc3161-client
- https://pypi.org/project/rfc3161-client
- https://github.com/advisories/GHSA-6qhv-4h7r-2g9m
- Vector CVSS
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- Debilidad (CWE)
CWE-347- Plataforma
- Python (PyPI)
- Paquete
rfc3161-client- Publicada
- 20.06.2025
- Actualizado
- 11.10.2026 14:17
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-6qhv-4h7r-2g9m - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-525 - PyPA Advisory Database; CC BY 4.0
Historial de vulnerabilidades: rfc3161-client
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 06.2025 04.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Media 1
Divulgaciones por año
- 2025: 1
- 2026: 1
-
rfc3161-client has insufficient verification for timestamp response signatures esta entrada
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