CVE-2026-49478

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-49478
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49478.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49478
Aliases
Downstream
Related
Published
2026-08-13T13:08:21.498Z
Modified
2026-08-16T03:31:26.194944079Z
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
Summary
Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage
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.

Database specific 
{
    "cwe_ids": [
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49478.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/sigstore/fulcio

Affected ranges

Type
GIT
Repo
https://github.com/sigstore/fulcio
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
378c654f48c3bafdced04ead7010aab2cb4c6ca1
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.6"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

0.*
0.1.0
v0.*
v0.1.1
v0.2.0
v0.3.0
v0.4.0
v0.4.1
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.6.0
v1.*
v1.0.0
v1.0.0-rc.0
v1.1.0
v1.2.0
v1.3.0
v1.3.1
v1.3.2
v1.3.3
v1.3.4
v1.4.0
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.5.0
v1.5.1
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.7.0
v1.7.1
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.8.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49478.json"