Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Rekor versions before 1.5.0 are vulnerable to server-side request forgery through the /api/v1/index/retrieve endpoint, which can fetch a public key from a user-supplied URL. An attacker with access to that endpoint can make the server send GET requests to arbitrary internal services, but the responses are not returned, so this is blind probing only. Upgrade to Rekor 1.5.0, which removes lookup by URL; alternatively, disable the search endpoint with the enable_retrieve_api=false setting.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0036, the 30th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:13 UTC First seen by agentprime
- 31 Oct 2026, 14:13 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-4c4x-jm2x-pf9j
- OSV: GHSA-4c4x-jm2x-pf9j
- github.com/sigstore/rekor/security/advisories/GHSA-4c4x-jm2x-pf9j
- nvd.nist.gov/vuln/detail/CVE-2026-24117
- github.com/sigstore/rekor/commit/60ef2bceba192c5bf9327d003bceea8bf1f8275f
- github.com/sigstore/rekor
- github.com/sigstore/rekor/releases/tag/v1.5.0