CVE-2026-49835: Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps

Q: How do I fix CVE-2026-49835?

sigstore timestamp authority: upgrade to 2.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-49835 being exploited?

CVE-2026-49835 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49835 affect?

CVE-2026-49835 affects sigstore timestamp authority. Severity is medium (CVSS 5.9). 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

Q: How urgent is CVE-2026-49835?

Priority 44/100. Remotely exploitable, no login, no user action; On your watchlist

This month

MEDIUM 5.9REMOTEWATCHLISTUPGRADE

CVE-2026-49835 is a medium-severity flaw (CVSS 5.9) affecting sigstore timestamp authority. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 permanen

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-07-17
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 19:17 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

linuxfoundation sigstore timestamp authority UPGRADE

Affected: < 2.1.0

Fixed in: 2.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sigstore-timestamp-authority || rpm -q sigstore-timestamp-authority || sigstore-timestamp-authority --version

2. UPGRADE to 2.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sigstore-timestamp-authority

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sigstore-timestamp-authority

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49835?

sigstore timestamp authority: upgrade to 2.1.0. Exact commands for each OS are on this page.

Is CVE-2026-49835 being exploited?

CVE-2026-49835 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49835 affect?

CVE-2026-49835 affects sigstore timestamp authority. Severity is medium (CVSS 5.9). 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

How urgent is CVE-2026-49835?

Priority 44/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Prometheus vulnerabilities

References

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