Is CVE-2026-49478 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-49478?

CVE-2026-49478 has a CVSS v3 severity of HIGH (8.7).

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CVE-2026-49478

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.