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Fencer Vulns
medium 5.9

CVE-2026-49835 json

Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality

published 2026-06-30 4 mo ago modified 2026-10-24 15 d ago also EUVD-2026-45245 , GHSA-9c54-x2g4-v92j , GO-2026-5851

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

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

Patch / fix

  • go github.com/sigstore/timestamp-authority/v2 2.1.0
  • linuxfoundation sigstore_timestamp_authority 2.1.0
  • golang-github-sigstore-timestamp-authority Debian 14 2.1.0-1

debian advisories DEBIAN-CVE-2026-49835

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • tekton-cli openSUSE Tumbleweed 0.45.1-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:11398-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-49835 updated cvss 5.9

timestamp-authority: Sigstore Timestamp Authority: Denial of Service via unbounded metric label cardinality

  • Red Hat Trusted Artifact Signer timestamp-authority
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go github.com/sigstore/timestamp-authority/v2
<2.1.0
2.1.0
go github.com/sigstore/timestamp-authority
<=1.2.9
all versions
 no fix listed

Affected products

  • sigstore timestamp-authority

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.