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CVE-2026-49835

Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality

Published: Jul 17, 2026Updated: Jul 30, 2026 Sources: CVE List NVDCWE-770
5.9MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 63.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

linuxfoundation
oss-project·USaka pytorch, everest, yocto
sigstore timestamp authorityOn-premSecurity Product
Security Products / pki-crypto
sigstore
oss-projectaka rekor, gitsign, cosign
timestamp-authorityOn-prem
Security Products / pki-crypto

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/sigstore/timestamp-authority/commit/506ec57b6ac2ea1e4739322e47453469425b69b5
github.com
https://github.com/sigstore/timestamp-authority/releases/tag/v2.1.0
github.com
https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-9c54-x2g4-v92j
github.com

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