PT-2025-49174 · Unknown+1 · Sigstore Timestamp Authority+1

Published 2025-01-01 · Updated 2026-05-18 · CVE-2025-66564

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Sigstore Timestamp Authority versions prior to 2.0.3

Description Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. The api.ParseJSONRequest and api.getContentType functions are susceptible to a denial-of-service issue due to excessive memory allocation. Specifically, these functions split untrusted data—an Object Identifier (OID) in the payload and the Content-Type header—on period characters and an application string, respectively. A malicious request containing a lengthy OID with numerous periods or a malformed Content-Type header can cause these functions to allocate memory proportional to the input length, potentially leading to a denial of service. The vulnerable functions are api.ParseJSONRequest and api.getContentType.

Recommendations Update to version 2.0.3 or later.

Exploit

Fix

Weakness Enumeration

CWE-405

Related Identifiers

CLEANSTART-2026-BD19566

CLEANSTART-2026-EZ47382

CLEANSTART-2026-GK29346

CLEANSTART-2026-HF07497

CLEANSTART-2026-NS33477

CLEANSTART-2026-NV36169

CLEANSTART-2026-WB12909

CVE-2025-66564

ECHO-F7D3-2463-68E7

GHSA-4QG8-FJ49-PXJH

GO-2025-4192

OPENSUSE-SU-2026:10131-1

OPENSUSE-SU-2026:20191-1

SUSE-SU-2025:4395-1

Affected Products

Debian

Sigstore Timestamp Authority

References · 197

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66564.json · Exploit
• https://github.com/sigstore/timestamp-authority/commit/0cae34e197d685a14904e0bad135b89d13b69421 · Patch
• https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-4qg8-fj49-pxjh · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-1229 · Security Note
• https://osv.dev/vulnerability/CLEANSTART-2026-GK29346 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27139 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-26958 · Security Note
• https://osv.dev/vulnerability/CLEANSTART-2026-HF07497 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-66564 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-66564 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-22703 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-23991 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-32282 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33814 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33810 · Security Note