# Sigstore vulnerabilities Source: https://junglewise.ai/threats/vendors/sigstore Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 12 November 2026, 20:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/sigstore.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 15 vulnerabilities in Sigstore: 0 in the last 7 days and 2 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-118763, was published on 29 October 2026. 2 vulnerabilities in the last four weeks, up from none in the four before. 1 technology has a page of its own. ## Counts - Last 7 days: 0 - Last 30 days: 2 - Last 90 days: 2 - All time: 15 (1 critical, 0 exploited in the wild) ## About Sigstore An open-source project providing tools and services for secure software signing and verification. ## Latest Sigstore vulnerabilities - [CVE-2026-118763: sigstore-js credential leak in OCI registry blob upload](https://junglewise.ai/threats/cve-2026-118763-sigstore-js-provides-javascript-libraries-for-interacting-with) (high, CVSS 7.4, published 29 Oct 2026) - [CVE-2026-54462: Knative pkg webhook admission memory exhaustion](https://junglewise.ai/threats/cve-2026-54462-knative-pkg-provides-common-packages-shared-across-knative) (medium, CVSS 6.5, published 27 Oct 2026) - [CVE-2026-48702: Sigstore Rekor OOM via unbounded decompression in Alpine APK parsing](https://junglewise.ai/threats/cve-2026-48702-sigstore-rekor-oom-via-unbounded-decompression-in-alpine-apk) (high, CVSS 7.5, published 13 Aug 2026) - [CVE-2026-49478: Sigstore Fulcio SSRF and Token Leakage in OIDC Discovery](https://junglewise.ai/threats/cve-2026-49478-sigstore-fulcio-ssrf-and-token-leakage-in-oidc-discovery) (high, CVSS 8.7, published 13 Aug 2026) - [CVE-2026-48791: Sigstore Java improper signature verification in KeylessVerifier](https://junglewise.ai/threats/cve-2026-48791-sigstore-java-improper-signature-verification-in-keylessverifier) (low, CVSS 3.1, published 13 Aug 2026) - [CVE-2026-54787: sigstore-go expired key usage in self-managed signing workflow](https://junglewise.ai/threats/cve-2026-54787-sigstore-go-expired-key-usage-in-self-managed-signing-workflow) (low, CVSS 3.1, published 31 Jul 2026) - [CVE-2026-49834: Sigstore sigstore-go multi-log threshold bypass](https://junglewise.ai/threats/cve-2026-49834-sigstore-sigstore-go-multi-log-threshold-bypass) (medium, CVSS 5.9, published 17 Jul 2026) - [CVE-2026-49835: Sigstore Timestamp Authority memory exhaustion in wrapMetrics middleware](https://junglewise.ai/threats/cve-2026-49835-sigstore-timestamp-authority-memory-exhaustion-in-wrapmetrics) (medium, CVSS 5.9, published 17 Jul 2026) - [CVE-2026-48816: sigstore-js insufficient verification of data authenticity in @sigstore/verify](https://junglewise.ai/threats/cve-2026-48816-sigstore-js-insufficient-verification-of-data-authenticity-in) (medium, CVSS 6.5, published 14 Jul 2026) - [CVE-2026-48815: sigstore-js improper verification of certificate OIDs](https://junglewise.ai/threats/cve-2026-48815-sigstore-js-improper-verification-of-certificate-oids) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-48758: sigstore-js signature type-binding failure in @sigstore/core](https://junglewise.ai/threats/cve-2026-48758-sigstore-js-signature-type-binding-failure-in-sigstore-core) (medium, CVSS 5.4, published 14 Jul 2026) - [CVE-2026-59891: Sigstore sigstore-js credential leakage via registry substring match](https://junglewise.ai/threats/cve-2026-59891-sigstore-sigstore-js-credential-leakage-via-registry-substring) (critical, CVSS 9.6, published 14 Jul 2026) - [CVE-2026-44310: Sigstore Gitsign signature verification bypass via empty certificate set](https://junglewise.ai/threats/cve-2026-44310-sigstore-gitsign-signature-verification-bypass-via-empty) (medium, CVSS 5.4, published 15 May 2026) - [CVE-2026-44309: Sigstore Gitsign improper signature verification via go-git re-encoding](https://junglewise.ai/threats/cve-2026-44309-sigstore-gitsign-improper-signature-verification-via-go-git-re) (medium, CVSS 5.3, published 15 May 2026) - [CVE-2026-39395: Sigstore Cosign validation bypass in verify-blob-attestation](https://junglewise.ai/threats/cve-2026-39395-sigstore-cosign-validation-bypass-in-verify-blob-attestation) (medium, CVSS 4.3, published 7 Apr 2026) ## Most severe Sigstore vulnerabilities - [CVE-2026-59891: Sigstore sigstore-js credential leakage via registry substring match](https://junglewise.ai/threats/cve-2026-59891-sigstore-sigstore-js-credential-leakage-via-registry-substring) (critical, CVSS 9.6, published 14 Jul 2026) - [CVE-2026-49478: Sigstore Fulcio SSRF and Token Leakage in OIDC Discovery](https://junglewise.ai/threats/cve-2026-49478-sigstore-fulcio-ssrf-and-token-leakage-in-oidc-discovery) (high, CVSS 8.7, published 13 Aug 2026) - [CVE-2026-48702: Sigstore Rekor OOM via unbounded decompression in Alpine APK parsing](https://junglewise.ai/threats/cve-2026-48702-sigstore-rekor-oom-via-unbounded-decompression-in-alpine-apk) (high, CVSS 7.5, published 13 Aug 2026) - [CVE-2026-48815: sigstore-js improper verification of certificate OIDs](https://junglewise.ai/threats/cve-2026-48815-sigstore-js-improper-verification-of-certificate-oids) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-118763: sigstore-js credential leak in OCI registry blob upload](https://junglewise.ai/threats/cve-2026-118763-sigstore-js-provides-javascript-libraries-for-interacting-with) (high, CVSS 7.4, published 29 Oct 2026) - [CVE-2026-54462: Knative pkg webhook admission memory exhaustion](https://junglewise.ai/threats/cve-2026-54462-knative-pkg-provides-common-packages-shared-across-knative) (medium, CVSS 6.5, published 27 Oct 2026) - [CVE-2026-48816: sigstore-js insufficient verification of data authenticity in @sigstore/verify](https://junglewise.ai/threats/cve-2026-48816-sigstore-js-insufficient-verification-of-data-authenticity-in) (medium, CVSS 6.5, published 14 Jul 2026) - [CVE-2026-49835: Sigstore Timestamp Authority memory exhaustion in wrapMetrics middleware](https://junglewise.ai/threats/cve-2026-49835-sigstore-timestamp-authority-memory-exhaustion-in-wrapmetrics) (medium, CVSS 5.9, published 17 Jul 2026) - [CVE-2026-49834: Sigstore sigstore-go multi-log threshold bypass](https://junglewise.ai/threats/cve-2026-49834-sigstore-sigstore-go-multi-log-threshold-bypass) (medium, CVSS 5.9, published 17 Jul 2026) - [CVE-2026-48758: sigstore-js signature type-binding failure in @sigstore/core](https://junglewise.ai/threats/cve-2026-48758-sigstore-js-signature-type-binding-failure-in-sigstore-core) (medium, CVSS 5.4, published 14 Jul 2026) ## Vulnerabilities per week 2 vulnerabilities in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 2 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Sigstore technologies - [Sigstore-Js](https://junglewise.ai/threats/technologies/sigstore-js): 5 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Sigstore vulnerabilities", https://junglewise.ai/threats/vendors/sigstore, 12 November 2026.