UBUNTU-CVE-2026-49478

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Source
https://ubuntu.com/security/CVE-2026-49478
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49478.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-49478
Upstream
Published
2026-08-13T13:19:00Z
Modified
2026-08-19T13:31:48.254852253Z
Severity
  • 8.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:26.04:LTS / golang-github-sigstore-fulcio

Package

Name
golang-github-sigstore-fulcio
Purl
pkg:deb/ubuntu/golang-github-sigstore-fulcio?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.6.5-1
1.7.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.7.1-1",
            "binary_name": "golang-github-sigstore-fulcio-dev"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49478.json"