CVE-2026-24117Network attack vector

Unauthenticated blind SSRF via public-key URL

Published Jan 22, 2026 · Updated Jan 22, 2026

SSRF in Sigstore Rekor before 1.5.0 allows remote attackers to make the server send GET requests to arbitrary internal services. The /api/v1/index/retrieve SearchIndexHandler passes a user-provided public-key URL to FileOrURLReadCloser, which performs an unrestricted HTTP GET. No authentication or user interaction is required; the blind response permits internal-network probing but neither response exfiltration nor state changes.

CVSS severity5.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SSRF in Sigstore Rekor before 1.5.0 allows remote attackers to make the server send GET requests to arbitrary internal services. The /api/v1/index/retrieve SearchIndexHandler passes a user-provided public-key URL to FileOrURLReadCloser, which performs an unrestricted HTTP GET. No authentication or user interaction is required; the blind response permits internal-network probing but neither response exfiltration nor state changes.

The record

CVE
CVE-2026-24117
Published
Jan 22, 2026
Updated
Jan 22, 2026
Vendor
Sigstore
Product
Rekor
Classifications
CWE-918, T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sigstore · Rekorversion=< 1.5.0

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo