# 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.

- Web page: https://patchblox.com/security/cve/CVE-2025-66564
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0048
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 4, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | golang-github-sigstore-timestamp-authority Debian 14 | 2.0.3-1 | [DEBIAN-CVE-2025-66564](https://patchblox.com/security/data/fix/linux/debian-cve-2025-66564.md) | Dec 4, 2025 |
| Linux | govulncheck-vulndb opensuse-leap 15.6 | 0.0.20251209T172047-150000.1.127.1 | [SUSE-SU-2025:4395-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4395-1.md) | Dec 15, 2025 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | govulncheck-vulndb sles 15.6 | 0.0.20251209T172047-150000.1.127.1 | [SUSE-SU-2025:4395-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4395-1.md) | Dec 15, 2025 |
| Linux | runfinch-finch amzn 2023 | 1.10.0-1.amzn2023.0.6 | [ALAS2023-2025-1336](https://patchblox.com/security/data/fix/linux/alas2023-2025-1336.md) | Jan 7, 2026 |
| Linux | trivy Fedora 43 | 0.69.3-1.fc43 | [FEDORA-2026-868E266938](https://patchblox.com/security/data/fix/linux/fedora-2026-868e266938.md) | Apr 4, 2026 |
| Linux | trivy-debuginfo Fedora 43 | 0.69.3-1.fc43 | [FEDORA-2026-868E266938](https://patchblox.com/security/data/fix/linux/fedora-2026-868e266938.md) | Apr 4, 2026 |
| Linux | trivy-debugsource Fedora 43 | 0.69.3-1.fc43 | [FEDORA-2026-868E266938](https://patchblox.com/security/data/fix/linux/fedora-2026-868e266938.md) | Apr 4, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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