CVE-2025-66564
Sigstore Timestamp Authority allocates excessive memory during request parsing in github.com/sigstore/timestamp-authority
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.
How to fix CVE-2025-66564
To remediate CVE-2025-66564, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 2.0.3 or later
- —no fix listed
- —upgrade to 2.0.3 or later
Is CVE-2025-66564 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0
- from 0, < 2.0.3
- from 0
- from 0, < 2.0.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |