medium5.9
CVE-2026-49835
Sigstore Timestamp Authority has OOM due to unbounded metric label cardinality
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/sigstore/timestamp-authority/v2 | <= 2.0.6 | 2.1.0 |
| go | github.com/sigstore/timestamp-authority | <= 1.2.9 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Sigstore Timestamp Authority | before 2.1.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-9c54-x2g4-v92j
- https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-9c54-x2g4-v92j
- https://github.com/sigstore/timestamp-authority/commit/506ec57b6ac2ea1e4739322e47453469425b69b5
- https://github.com/sigstore/timestamp-authority/releases/tag/v2.1.0