{"id":"DEBIAN-CVE-2026-23831","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.","modified":"2026-08-27T23:05:47.858946270Z","published":"2026-01-22T22:16:19.523Z","upstream":["CVE-2026-23831"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23831"}],"affected":[{"package":{"name":"rekor","ecosystem":"Debian:13","purl":"pkg:deb/debian/rekor?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.10-1","1.3.9-1","1.4.0-1","1.4.2-1","1.4.3-1","1.5.0-1","1.5.1-1","1.5.2-1","1.5.3-1","1.5.3-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23831.json"}},{"package":{"name":"rekor","ecosystem":"Debian:14","purl":"pkg:deb/debian/rekor?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.0-1"}]}],"versions":["1.3.10-1","1.3.9-1","1.4.0-1","1.4.2-1","1.4.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23831.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}