{"cve":"CVE-2026-25793","nvd":{"published":"2026-02-06T23:15:54.830","modified":"2026-06-17T10:25:15.267","status":"Analyzed","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-347"],"references":["https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21","https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962"],"products":["slack:nebula"],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2026-25793","score":0.00145,"percentile":0.03726,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-69x3-g4r3-p962","url":"https://osv.dev/vulnerability/GHSA-69x3-g4r3-p962","summary":"Blocklist Bypass possible via ECDSA Signature Malleability","modified":"2026-09-10T03:49:48.430160154Z","packages":[{"ecosystem":"Go","name":"github.com/slackhq/nebula","purl":"pkg:golang/github.com/slackhq/nebula","ranges":[">=1.7.0 <1.10.3"],"fixed":["1.10.3"]}]},{"id":"GO-2026-4458","url":"https://osv.dev/vulnerability/GO-2026-4458","summary":"Blocklist Bypass possible via ECDSA Signature Malleability in github.com/slackhq/nebula","modified":"2026-02-21T01:58:57.172918Z","packages":[{"ecosystem":"Go","name":"github.com/slackhq/nebula","purl":"pkg:golang/github.com/slackhq/nebula","ranges":[">=1.7.0 <1.10.3"],"fixed":["1.10.3"]}]}],"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."]}