# CVE-2026-49478: golang-github-sigstore-fulcio: Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity

CVE-2026-49478 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-49478, released July 27, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-49478
- Priority: High
- CVSS: 8.7 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 30, 2026

## Description

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | golang-github-sigstore-fulcio Debian 14 | 1.8.7-1 | [DEBIAN-CVE-2026-49478](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49478.md) | Jul 27, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | runfinch-finch amzn 2023 | 1.17.2-1.amzn2023.0.3 | [ALAS2023-2026-2023](https://patchblox.com/security/data/fix/linux/alas2023-2026-2023.md) | Aug 3, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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