{"id":"CVE-2026-39320","aliases":["GHSA-7gcj-phff-2884"],"url":"https://o3.security/vulnerability/CVE-2026-39320","summary":"Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths","details":"Signal K Server is a server application that runs on a central hub in a boat. Versions prior to 2.25.0 are vulnerable to an unauthenticated Regular Expression Denial of Service (ReDoS) attack within the WebSocket subscription handling logic. By injecting unescaped regex metacharacters into the `context` parameter of a stream subscription, an attacker can force the server's Node.js event loop into a catastrophic backtracking loop when evaluating long string identifiers (like the server's self UUID). This results in a total Denial of Service (DoS) where the server CPU spikes to 100% and becomes completely unresponsive to further API or socket requests. Version 2.25.0 contains a fix.","published":"2026-04-21T00:07:10.371Z","modified":"2026-07-15T01:49:14.361179530Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"signalk-server","fixedVersion":"2.25.0"}],"fix":{"url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","label":"SignalK/signalk-server@215d81e"},"references":[{"type":"WEB","url":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39320.json"},{"type":"ADVISORY","url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39320"},{"type":"FIX","url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d"},{"type":"FIX","url":"https://github.com/SignalK/signalk-server/pull/2568"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:14.361179530Z"}}