{"id":"CVE-2026-39320","sourceIdentifier":"security-advisories@github.com","published":"2026-04-21T01:16:05.063","lastModified":"2026-06-17T10:41:54.893","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"SignalK","product":"signalk-server","versions":[{"version":"< 2.25.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-21T19:36:30.279521Z","id":"CVE-2026-39320","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-400"},{"lang":"en","value":"CWE-1333"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*","versionEndExcluding":"2.25.0","matchCriteriaId":"2DAD2E1E-F9F3-40FA-B483-3AB2A3093CFB"}]}]}],"references":[{"url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/SignalK/signalk-server/pull/2568","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]}]}