{"cve":"CVE-2026-23831","nvd":{"published":"2026-01-22T22:16:19.523","modified":"2026-06-17T10:22:10.360","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-476"],"references":["https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd","https://github.com/sigstore/rekor/releases/tag/v1.5.0","https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833"],"products":["linuxfoundation:rekor"],"source":"nvd","synced_at":"2026-10-19T22:21:16.563232421+00:00"},"epss":{"cve":"CVE-2026-23831","score":0.00426,"percentile":0.36887,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-273p-m2cw-6833","url":"https://osv.dev/vulnerability/GHSA-273p-m2cw-6833","summary":"Rekor's COSE v0.0.1 entry type nil pointer dereference in Canonicalize via empty Message","modified":"2026-09-10T03:50:32.343012154Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/rekor","purl":"pkg:golang/github.com/sigstore/rekor","ranges":["<1.5.0"],"fixed":["1.5.0"]}]},{"id":"GO-2026-4354","url":"https://osv.dev/vulnerability/GO-2026-4354","summary":"Rekor's COSE v0.0.1 entry type nil pointer dereference in Canonicalize via empty Message in github.com/sigstore/rekor","modified":"2026-02-04T03:44:35.829677Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/rekor","purl":"pkg:golang/github.com/sigstore/rekor","ranges":["<1.5.0"],"fixed":["1.5.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}