CVE-2025-52556
CVE-2025-52556 · rfc3161-client has insufficient verification for timestamp response signatures
This page contains facts from public vulnerability sources. Check the original advisory before updating.
rfc3161-client is a Python library implementing the Time-Stamp Protocol (TSP) described in RFC 3161. Prior to version 1.0.3, there is a flaw in the timestamp response signature verification logic. In particular, chain verification is performed 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. This issue has been patched in version 1.0.3. There is no workaround for this issue.
CVSS 9.3 · Critical · EPSS 0.2% · Fix available
- Published
- Updated
Stack: python
Affected products and versions
rfc3161-client
- Versions
- < 1.0.3: Affected
No fix published
rfc3161-client PyPI
- Versions
- 0.0.2
- 0.0.3
- 0.0.4
- 0.1.0
- 0.1.1
- 0.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- Affected ranges
- ECOSYSTEM: < 1.0.3
Update to 1.0.3