---
cve: "CVE-2025-66564"
severity: "HIGH"
cvss: 7.5
epss: "45%"
vendor: "sigstore"
kev: false
exploited: false
published: "2025-12-04 23:15:47"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T22:31:18+02:00"
---

# CVE-2025-66564

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 22406c3ff80d3543d2f2819e4f3cf944b5fe306c (Commit)
- 0cae34e197d685a14904e0bad135b89d13b69421 (Commit)

## Referenzen

- <https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-4qg8-fj49-pxjh>
- <https://github.com/sigstore/timestamp-authority/commit/0cae34e197d685a14904e0bad135b89d13b69421>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-66564) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_