CVE-2026-49835
Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.1.0, the global wrapMetrics middleware records raw HTTP request path r.URL.Path and raw HTTP request method r.Method as Prometheus labels for latency and request count metric vectors before routing, allowing an unauthenticated remote attacker to issue requests with random paths such as /api/v1/timestamp/<uuid> or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.74% · top 45% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
sigstore · timestamp-authority
- affected < 2.1.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/sigstore/timestamp-authorityGHSA-9c54-x2g4-v92j (opens in a new tab)
- Gogithub.com/sigstore/timestamp-authority/v2GHSA-9c54-x2g4-v92j (opens in a new tab)
References (3)
- https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-9c54-x2g4-v92j (opens in a new tab)x_refsource_CONFIRM
- https://github.com/sigstore/timestamp-authority/commit/506ec57b6ac2ea1e4739322e47453469425b69b5 (opens in a new tab)x_refsource_MISC
- https://github.com/sigstore/timestamp-authority/releases/tag/v2.1.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9c54-x2g4-v92j (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-49835)Record last updated .