What is CVE-2026-49478?

CVE-2026-49478 is a high-severity vulnerability in Sigstore Fulcio, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.7/10. Published 2026-08-13.

How severe is CVE-2026-49478?

High severity. CVSS v3 base score is 8.7 out of 10.

SSRF in Sigstore Fulcio

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 ServiceAccount tokens during OIDC discovery…

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.

Affected products

Sigstore Fulcio — versions < 1.8.6

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-49478?: CVE-2026-49478 is a high-severity vulnerability in Sigstore Fulcio, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.7/10. Published 2026-08-13.
How severe is CVE-2026-49478?: High severity. CVSS v3 base score is 8.7 out of 10.