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CVE-2026-49835

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-49835

Severity

5.9

Medium

CVSS V3

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Summary

Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality

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/ or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.

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