CVE-2026-24117: Rekor affected by Server-Side Request Forgery (SSRF) via provided public key URL

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-22 · updated 2026-06-17
Weakness: CWE-918

Description

Rekor is a software supply chain transparency log. In versions 1.4.3 and below, attackers can trigger SSRF to arbitrary internal services because /api/v1/index/retrieve supports retrieving a public key via user-provided URL. 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. The issue has been fixed in version 1.5.0. To workaround this issue, disable the search endpoint with --enable_retrieve_api=false.

Affected products

sigstore rekor: before 1.5.0 — fixed in 1.5.0

How to fix

Upgrade to a fixed version: sigstore rekor 1.5.0. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-24117 or the next vulnerability affects your stack