CVE-2026-24117: Github.com/sigstore/rekor Rekor Affected By Server-Side Request Vulnerability

MODERATE
Advisory Identifier: GHSA-4c4x-jm2x-pf9j
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CVSS 5.3
CWE-918
Published
Advisory Summary

CVE-2026-24117 is a MODERATE (CVSS 5.3) rekor affected by server-side request vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Github.com/sigstore/rekor libraries in the Go ecosystem. The issue involves rekor affected by server-side request forgery (ssrf) via provided public key url. Remediation is available by upgrading affected packages to version 1.5.0.

CVE-2026-24117 at a Glance

CVE Identifier CVE-2026-24117
GHSA Identifier GHSA-4c4x-jm2x-pf9j
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Github.com/sigstore/rekor
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-24117

To remediate this vulnerability, upgrade all affected Github.com/sigstore/rekor dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/sigstore/rekor fixed: 1.5.0 
Upgrade github.com/sigstore/rekor to 1.5.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/sigstore/rekor

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-24117, inspect your project dependencies for Github.com/sigstore/rekor:

inspect dependencies for github.com/sigstore/rekor

Analyze the terminal output to locate any version of Github.com/sigstore/rekor in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Github.com/sigstore/rekor, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## 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](https://portswigger.net/web-security/ssrf/blind). ## 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`.

CVE-2026-24117 Affected Github.com/sigstore/rekor Versions

1 component(s)
Fixed Versions:
1.5.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/sigstore/rekor
golang/github.com/sigstore/rekor
Go
< 1.5.0
1.5.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/sigstore/rekor/security/advisories/GHSA-4c4x-jm2x-pf9j
NVD — CVE-2026-24117 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-24117
Security Fix Commit FIX COMMIT
https://github.com/sigstore/rekor/commit/60ef2bceba192c5bf9327d003bceea8bf1f8275f
Github.com/sigstore/rekor Source Repository REPOSITORY
https://github.com/sigstore/rekor
Github.com/sigstore/rekor Release RELEASE
https://github.com/sigstore/rekor/releases/tag/v1.5.0

Frequently Asked Questions

What is CVE-2026-24117?
CVE-2026-24117 is a security vulnerability in Github.com/sigstore/rekor involving Rekor affected by Server-Side Request Forgery (SSRF) via provided public key URL under CWE-918: Server-Side Request Forgery (SSRF).
Which Github.com/sigstore/rekor versions are affected?
Affected versions include releases prior to 1.5.0 across affected packages: github.com/sigstore/rekor.
What version fixes CVE-2026-24117?
Upgrading to 1.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/sigstore/rekor affected?
Yes, github.com/sigstore/rekor is affected in releases prior to 1.5.0. Upgrade your dependency to 1.5.0 or later.
What is the CVSS score of CVE-2026-24117?
CVE-2026-24117 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-24117?
CVE-2026-24117 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Go dependencies for CVE-2026-24117?
Run the dependency tree command: 'inspect dependencies for github.com/sigstore/rekor'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4c4x-jm2x-pf9j",
  "modified" : "2026-01-23T15:49:13Z",
  "published" : "2026-01-22T18:41:26Z",
  "aliases" : [ "CVE-2026-24117" ],
  "summary" : "Rekor affected by Server-Side Request Forgery (SSRF) via provided public key URL",
  "details" : "## Summary\n\n`/api/v1/index/retrieve` supports retrieving a public key via a user-provided URL, allowing attackers to trigger SSRF to arbitrary internal services.\n\nSince 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](https://portswigger.net/web-security/ssrf/blind).\n\n## Impact\n\n* SSRF to cloud metadata (169.254.169.254)\n* SSRF to internal Kubernetes APIs\n* SSRF to any service accessible from Fulcio's network\n\n## Patches\n\nUpgrade 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.\n\n## Workarounds\n\nDisable the search endpoint with `--enable_retrieve_api=false`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/sigstore/rekor"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.5.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.4.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sigstore/rekor/security/advisories/GHSA-4c4x-jm2x-pf9j"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-24117"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sigstore/rekor/commit/60ef2bceba192c5bf9327d003bceea8bf1f8275f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sigstore/rekor"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sigstore/rekor/releases/tag/v1.5.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-22T18:41:26Z",
    "nvd_published_at" : "2026-01-22T22:16:21Z"
  }
}