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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| sigstore | timestamp-authority | < 2.1.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | golang-github-sigstore-timestamp-authority | 2.1.0-1 | — |
| Debian 13 | golang-github-sigstore-timestamp-authority | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | golang-github-sigstore-timestamp-authority | No fix yet | — |
| Ubuntu 26.04 LTS | golang-github-sigstore-timestamp-authority | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tekton-cli | 0.45.1-1.1 | openSUSE-SU-2026:11398-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | runfinch-finch | 1.17.2-1.amzn2023.0.3 | ALAS2023-2026-2023 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | aactl | 0.4.12-r59 | — |
| Wolfi rolling | crossplane-2.2 +1 | 2.2.3-r5 | — |
| Wolfi rolling | falcoctl | 0.13.0-r11 | — |
| Wolfi rolling | gitsign | 0.16.1-r4 | — |
| Wolfi rolling | goreleaser | 2.16.0-r6 | — |
| Wolfi rolling | kubescape | 4.0.10-r4 | — |
| Wolfi rolling | kyverno-1.17 | 1.17.2-r35 | — |
| Wolfi rolling | kyverno-1.18 +5 | 1.18.1-r10 | — |
| Wolfi rolling | kyverno-cli-1.17 +4 | 1.17.2-r16 | — |
| Wolfi rolling | kyverno-notation-aws | 1.1-r64 | — |
| Wolfi rolling | neuvector-sigstore-interface | 0_git20260617-r3 | — |
| Wolfi rolling | policy-controller +1 | 0.15.1-r15 | — |
| Wolfi rolling | ratify | 1.4.3-r0 | — |
| Wolfi rolling | ratify-licensechecker-compat | 1.4.5-r4 | — |
| Wolfi rolling | slsa-verifier +3 | No fix yet | — |
| Wolfi rolling | spire-agent | 1.15.1-r4 | — |
| Wolfi rolling | tekton-chains | 0.27.1-r5 | — |
| Wolfi rolling | tflint | 0.63.1-r3 | — |
| Wolfi rolling | tkn | 0.45.0-r8 | — |
| Wolfi rolling | trivy | 0.72.0-r1 | — |
| Wolfi rolling | trivy-operator | 0.30.1-r22 | — |
| Wolfi rolling | zarf | 0.80.0-r3 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/sigstore/timestamp-authority | <= 1.2.9 | — | GHSA-9c54-x2g4-v92j |
| Go | github.com/sigstore/timestamp-authority | all versions | — | GO-2026-5851 |
| Go | github.com/sigstore/timestamp-authority/v2 | < 2.1.0 | 2.1.0 | GHSA-9c54-x2g4-v92j |
Advisories 3
- ALAS2023-2026-2023 Important: runfinch-finch security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 4, 2026
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- openSUSE-SU-2026:11398-1 tekton-cli-0.45.1-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026