Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-30T18:40:39 timestamp-authority: Sigstore Timestamp Authority: Denial of Service via unbounded metric label cardinality 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-770

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.

A flaw was found in Sigstore Timestamp Authority. An unauthenticated remote attacker can exploit this vulnerability by sending requests with arbitrary HTTP paths and methods. This leads to the creation of an excessive number of unique metric labels, causing unbounded memory growth and a denial of service (DoS) condition on the server. This issue is a type of Improper Restriction of Resource Consumption (CWE-770).

A flaw was found in the Sigstore Timestamp Authority. The wrapMetrics middleware records raw HTTP request paths and methods as Prometheus labels, allowing unbounded memory growth via requests with random paths. Red Hat Trusted Artifact Signer ships a fixed version and is not affected. Upgrade to timestamp-authority v2.0.7/v2.1.0 or later. As a workaround, block invalid methods and unknown paths at a reverse proxy. Red Hat Trusted Artifact Signer Not affected timestamp-authority https://www.cve.org/CVERecord?id=CVE-2026-49835 https://nvd.nist.gov/vuln/detail/CVE-2026-49835 https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-9c54-x2g4-v92j