Resource exhaustion in Linuxfoundation Sigstore Timestamp Authority
CVE-2026-49835
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Linuxfoundation Sigstore Timestamp Authority
- Sigstore Timestamp-Authority — versions < 2.1.0
Weakness classification (CWE)
References
- github.com/sigstore/timestamp-authority/security/advisories/GHSA-9c54-x2g4-v92j (Mitigation, Vendor Advisory)
- github.com/sigstore/timestamp-authority/commit/506ec57b6ac2ea1e4739322e47453469… (Patch)
- github.com/sigstore/timestamp-authority/releases/tag/v2.1.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-49835?
- CVE-2026-49835 is a medium-severity vulnerability in Linuxfoundation Sigstore Timestamp Authority, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.9/10. Published 2026-07-17.
- How severe is CVE-2026-49835?
- Medium severity. CVSS v3 base score is 5.9 out of 10.