CVE catalog
CVE-2026-49478
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 Servi
- Severity
- High · CVSS 8.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.28% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Go | github.com/sigstore/fulcio | Not reported | 1.8.6 | fixed |
| Debian | golang-github-sigstore-fulcio | 13 | 1.6.5-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 13 | 1.7.1-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 13 | 1.8.5-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 13 | 1.8.7-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 13 | 1.8.8-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 14 | 1.6.5-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 14 | 1.7.1-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 14 | 1.8.5-1 | vulnerable |
| Debian | golang-github-sigstore-fulcio | 14 | 1.8.7-1 | fixed |
| Ubuntu | golang-github-sigstore-fulcio | 26.04 | 1.6.5-1 | vulnerable |
| Ubuntu | golang-github-sigstore-fulcio | 26.04 | 1.7.1-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Go | github.com/sigstore/fulcio | Go | Not reported | 1.8.6 | Not reported | GHSA-F5MR-Q85P-6HH6 | Not reported |
| Debian | golang-github-sigstore-fulcio | deb | 14 | 1.8.7-1 | Not reported | DEBIAN-CVE-2026-49478 | Not reported |
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [golang-github-sigstore-fulcio-dev]Affected
Source package: [golang-github-sigstore-fulcio]
Details (2)
1.6.5-1· all · trixieAffected
nvd · golang-github-sigstore-fulcio · debian · 13
1.6.5-1· all · trixieAffected
nvd · golang-github-sigstore-fulcio · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://github.com/sigstore/fulcio/commit/378c654f48c3bafdced04ead7010aab2cb4c6ca1]
- [https://github.com/sigstore/fulcio/pull/2354]
- [https://github.com/sigstore/fulcio/releases/tag/v1.8.6]
- [https://github.com/sigstore/fulcio/security/advisories/GHSA-f5mr-q85p-6hh6]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-49478]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-49478]
- [https://osv.dev/vulnerability/GHSA-f5mr-q85p-6hh6]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-49478]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49478.json]
[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]