UBUNTU-CVE-2026-23831

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Source
https://ubuntu.com/security/CVE-2026-23831
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23831.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-23831
Upstream
Published
2026-01-22T22:16:00Z
Modified
2026-01-30T20:31:39.131826Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message, causing nil Pointer Dereference. Function validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload. A malformed proposed entry of the cose/v0.0.1 type can cause a panic on a thread within the Rekor process. The thread is recovered so the client receives a 500 error message and service still continues, so the availability impact of this is minimal. This issue has been fixed in version 1.5.0.

References

Affected packages

Ubuntu:25.10 / rekor

Package

Name
rekor
Purl
pkg:deb/ubuntu/rekor@1.3.9-1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.3.7-1
1.3.9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-sigstore-rekor-dev",
            "binary_version": "1.3.9-1"
        },
        {
            "binary_name": "rekor",
            "binary_version": "1.3.9-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23831.json"