CVE-2025-52556

Description

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.

Reserved 2025-06-18 | Published 2025-06-21 | Updated 2025-06-21 | Assigner GitHub_M

Problem types

CWE-347: Improper Verification of Cryptographic Signature

Product status

< 1.0.3
affected

References

github.com/...client/security/advisories/GHSA-6qhv-4h7r-2g9m

github.com/...ommit/724a184f953e3f171f85cb223871172b41b0d0dc

cve.org (CVE-2025-52556)

nvd.nist.gov (CVE-2025-52556)

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