7.5

CVE-2026-49835: Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality

Analyzed
AliasesUBUNTU-CVE-2026-49835DEBIAN-CVE-2026-49835CGA-22r4-xgj9-xv94
Published 17-07-2026Last modified 17-07-2026

Vulnerability summary

CVE-2026-49835 is a high (CVSS 7.5) vulnerability in linuxfoundation sigstore_timestamp_authority. EPSS estimates a 0.74% chance of exploitation in the next 30 days, higher than 54.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.74%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:11398-1OPENSUSE-SU-2026:21483-1CGA-XV2X-9FM8-P3F6

Timeline

  1. 17-07-2026
    PublishedVulnerability first disclosed.
  2. 17-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.74%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.74% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard171 products
  • aactl< 0.4.12-r59
  • chainctl< 0.2.300-r2
  • chainctl-fips< 0.2.300-r2
  • cloudbeat-8.17All versions (No fix recorded)
  • cloudbeat-9.0All versions (No fix recorded)
Wolfi29 products
  • aactl< 0.4.12-r59
  • crossplane-2.1< 2.1.7-r4
  • crossplane-2.2< 2.2.3-r5
  • crossplane-2.2-crank< 2.2.3-r5
  • falcoctl< 0.13.0-r11

2 vendors · 200 products · Showing 200 of 220

References

9 links