🛡️ CVE-2025-66564
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-405 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-405
Public Exploit ✅ No
Source NVD
Published 2025-12-05
Updated 2026-06-15
Modified 2026-02-04

Affected Packages

Software From version Fixed in
github.com/sigstore/timestamp-authority — —
github.com/sigstore/timestamp-authority/v2 — —
sigstore-timestamp-authority — 2.0.3

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