Medium [CVE-2026-49835] Denial of Service via unbounded metric label cardinality
This medium-severity Red Hat Linux advisory covers CVE-2026-49835.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
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. 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). Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Red Hat lists Red Hat Trusted Artifact Signer as not affected.
Is CVE-2026-49835 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-49835 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-49835?
Upgrade to a fixed release named by Red Hat:
- 2.1.0
Confirm against the vendor advisory before you patch.
- < 2.1.0
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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