CVE-2025-66564

golang-github-sigstore-timestamp-authority: Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps

CVE-2025-66564 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2025-66564, released December 4, 2025. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.5
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0048
41st percentile

Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.0.3, Function api.ParseJSONRequest currently splits (via a call to strings.Split) an optionally-provided OID (which is untrusted data) on periods. Similarly, function api.getContentType splits the Content-Type header (which is also untrusted data) on an application string. As a result, in the face of a malicious request with either an excessively long OID in the payload containing many period characters or a malformed Content-Type header, a call to api.ParseJSONRequest or api.getContentType incurs allocations of O(n) bytes (where n stands for the length of the function's argument). This vulnerability is fixed in 2.0.3.

Where it's fixed

ProductFixed inFixReleased
Linux
golang-github-sigstore-timestamp-authority · Debian 14 2.0.3-1 DEBIAN-CVE-2025-66564 Dec 4, 2025
govulncheck-vulndb · opensuse-leap 15.6 0.0.20251209T172047-150000.1.127.1 SUSE-SU-2025:4395-1 Dec 15, 2025
govulncheck-vulndb · opensuse-leap 16.0 0.0.20260723T184607-160000.1.1 OPENSUSE-SU-2026:21483-1 Jul 30, 2026
govulncheck-vulndb · sles 15.6 0.0.20251209T172047-150000.1.127.1 SUSE-SU-2025:4395-1 Dec 15, 2025
runfinch-finch · amzn 2023 1.10.0-1.amzn2023.0.6 ALAS2023-2025-1336 Jan 7, 2026
trivy · Fedora 43 0.69.3-1.fc43 FEDORA-2026-868E266938 Apr 4, 2026
trivy-debuginfo · Fedora 43 0.69.3-1.fc43 FEDORA-2026-868E266938 Apr 4, 2026
trivy-debugsource · Fedora 43 0.69.3-1.fc43 FEDORA-2026-868E266938 Apr 4, 2026

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