{"id":"CVE-2026-25793","aliases":["GHSA-69x3-g4r3-p962","GO-2026-4458"],"url":"https://o3.security/vulnerability/CVE-2026-25793","summary":"Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability","details":"Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.","published":"2026-02-06T22:55:36.011Z","modified":"2026-07-31T18:31:40.121521202Z","cvss":null,"epss":{"score":0.00133,"percentile":0.03199,"asOf":"2026-08-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/slackhq/nebula","fixedVersion":"1.10.3"}],"fix":{"url":"https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21","label":"slackhq/nebula@f573e8a"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25793.json"},{"type":"ADVISORY","url":"https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25793"},{"type":"FIX","url":"https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:40.121521202Z"}}