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CVE-2025-52556 — Vulnerability in rfc3161-client — CVE Details

CRITICAL

rfc3161-client has insufficient verification for timestamp response signatures

Published June 29, 2026Updated July 13, 2026Source: osv

Summary

### 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.

Advisory Timeline

  • First published June 29, 2026 (105 days ago).
  • Last revised July 13, 2026 — 14 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update rfc3161-client to 1.0.3 or later
pip install "rfc3161-client>=1.0.3"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
rfc3161-client
pypi
0.0.2, 0.0.3, 0.0.4, 0.1.0 (+5 more)1.0.3

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2025-52556?
rfc3161-client has insufficient verification for timestamp response signatures This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2025-52556?
CVE-2025-52556 affects rfc3161-client. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-52556 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

PYSEC-2026-525
GHSA-6qhv-4h7r-2g9m

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