GHSA-4c4x-jm2x-pf9j

Suggest an improvement
Source
https://github.com/advisories/GHSA-4c4x-jm2x-pf9j
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-4c4x-jm2x-pf9j/GHSA-4c4x-jm2x-pf9j.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-4c4x-jm2x-pf9j
Aliases
Downstream
Published
2026-01-22T18:41:26Z
Modified
2026-01-23T16:05:41.963826Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Rekor affected by Server-Side Request Forgery (SSRF) via provided public key URL
Details

Summary

/api/v1/index/retrieve supports retrieving a public key via a user-provided URL, allowing attackers to trigger SSRF to arbitrary internal services.

Since the SSRF only can trigger GET requests, the request cannot mutate state. The response from the GET request is not returned to the caller so data exfiltration is not possible. A malicious actor could attempt to probe an internal network through Blind SSRF.

Impact

  • SSRF to cloud metadata (169.254.169.254)
  • SSRF to internal Kubernetes APIs
  • SSRF to any service accessible from Fulcio's network

Patches

Upgrade to v1.5.0. Note that this is a breaking change to the search API and fully disables lookups by URL. If you require this feature, please reach out and we can discuss alternatives.

Workarounds

Disable the search endpoint with --enable_retrieve_api=false.

Database specific 
{
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-918"
    ],
    "severity": "MODERATE",
    "github_reviewed_at": "2026-01-22T18:41:26Z",
    "nvd_published_at": "2026-01-22T22:16:21Z"
}
References

Affected packages

Go / github.com/sigstore/rekor

Package

Name
github.com/sigstore/rekor
View open source insights on deps.dev
Purl
pkg:golang/github.com/sigstore/rekor

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.5.0

Database specific

last_known_affected_version_range

"<= 1.4.3"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-4c4x-jm2x-pf9j/GHSA-4c4x-jm2x-pf9j.json"