{"id":"CVE-2026-23831","state":"PUBLISHED","title":"Rekor COSE v0.0.1 Canonicalize crashes when passed empty Message","description":"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.","publishedAt":"2026-01-22T21:26:22.183Z","updatedAt":"2026-01-23T14:32:43.078Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["sigstore rekor"],"affected":[{"vendor":"sigstore","product":"rekor","versions":[{"version":"< 1.5.0","status":"affected"}]}],"references":["https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833","https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd","https://github.com/sigstore/rekor/releases/tag/v1.5.0"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23831.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23831","state":"PUBLISHED","datePublished":"2026-01-22T21:26:22.183Z","dateUpdated":"2026-01-23T14:32:43.078Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-16T15:46:40.841Z"},"containers":{"cna":{"title":"Rekor COSE v0.0.1 Canonicalize crashes when passed empty Message","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"sigstore","product":"rekor","versions":[{"version":"< 1.5.0","status":"affected"}]}],"references":[{"url":"https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833","name":"https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd","name":"https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd","tags":["x_refsource_MISC"]},{"url":"https://github.com/sigstore/rekor/releases/tag/v1.5.0","name":"https://github.com/sigstore/rekor/releases/tag/v1.5.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-22T21:26:22.183Z"},"source":{"advisory":"GHSA-273p-m2cw-6833","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-23T14:32:37.244354Z","id":"CVE-2026-23831","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-23T14:32:43.078Z"}}]}}}