CVE-2026-49835mediumCWE-770

CVE-2026-49835: medium-severity vulnerability in sigstore timestamp-authority

Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.9epss 0.7%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
sigstore · timestamp-authority
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CVE-2025-66564HIGHSigstore Timestamp Authority allocates excessive memory during request parsingEPSS 0.5%CVE-2026-39984MEDIUMSigstore Timestamp Authority has Improper Certificate Validation in verifierEPSS 0.1%