CVE-2026-24117: Rekor affected by Server-Side Request Forgery (SSRF) via provided public key URL
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 --enableretrieveapi=false.
Other sources
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 --enableretrieveapi=false.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-24117?
The severity of CVE-2026-24117 is considered to be moderate due to its SSRF nature affecting internal services.
How do I fix CVE-2026-24117?
To fix CVE-2026-24117, update your version of the rekor package to at least 1.5.0.
What does CVE-2026-24117 exploit?
CVE-2026-24117 exploits a vulnerability in the /api/v1/index/retrieve endpoint that allows SSRF via user-provided URLs.
Which versions of rekor are affected by CVE-2026-24117?
Versions of rekor from 1.4.3 and earlier are affected by CVE-2026-24117.
What is SSRF in the context of CVE-2026-24117?
In the context of CVE-2026-24117, SSRF refers to Server-Side Request Forgery, allowing attackers to access internal services through crafted requests.