CVE-2025-66564
7.5 · HIGHOverview
CVE-2025-66564 is a high-severity vulnerability affecting linuxfoundation sigstore_timestamp_authority. It was published on December 4, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from linuxfoundation. Update sigstore_timestamp_authority to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linuxfoundation | sigstore_timestamp_authority | >= 0, < 2.0.3 | Affected |
Frequently Asked Questions
What is CVE-2025-66564?
CVE-2025-66564 is a high-severity vulnerability affecting linuxfoundation sigstore_timestamp_authority. It was published on December 4, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2025-66564?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-66564?
Check the references section for vendor advisories and patches from linuxfoundation. Update sigstore_timestamp_authority to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66564?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66564 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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