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  5. CVE-2025-66564

CVE-2025-66564: Sigstore Timestamp Authority allocates excessive memory during request parsing

December 5, 2025

Excessive memory allocation

References

  • github.com/advisories/GHSA-4qg8-fj49-pxjh
  • github.com/sigstore/timestamp-authority
  • github.com/sigstore/timestamp-authority/commit/0cae34e197d685a14904e0bad135b89d13b69421
  • github.com/sigstore/timestamp-authority/security/advisories/GHSA-4qg8-fj49-pxjh
  • nvd.nist.gov/vuln/detail/CVE-2025-66564

Code Behaviors & Features

Detect and mitigate CVE-2025-66564 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions before 2.0.3

Fixed versions

  • 2.0.3

Solution

Upgrade to version 2.0.3 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-405: Asymmetric Resource Consumption (Amplification)

Source file

go/github.com/sigstore/timestamp-authority/CVE-2025-66564.yml

Spotted a mistake? Edit the file on GitLab.

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