{"id":"CVE-2026-39320","state":"PUBLISHED","title":"Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths","description":"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.","publishedAt":"2026-04-21T00:07:10.371Z","updatedAt":"2026-04-21T19:36:54.787Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["SignalK signalk-server"],"affected":[{"vendor":"SignalK","product":"signalk-server","versions":[{"version":"< 2.25.0","status":"affected"}]}],"references":["https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","https://github.com/SignalK/signalk-server/pull/2568","https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","https://github.com/SignalK/signalk-server/releases/tag/v2.25.0"],"weaknesses":["CWE-400","CWE-1333"],"ingestedAt":"2026-10-29T20:11:50.837Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/39xxx/CVE-2026-39320.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39320","state":"PUBLISHED","datePublished":"2026-04-21T00:07:10.371Z","dateUpdated":"2026-04-21T19:36:54.787Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-06T19:31:07.266Z"},"containers":{"cna":{"title":"Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths","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":[{"vendor":"SignalK","product":"signalk-server","versions":[{"version":"< 2.25.0","status":"affected"}]}],"references":[{"url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","name":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/SignalK/signalk-server/pull/2568","name":"https://github.com/SignalK/signalk-server/pull/2568","tags":["x_refsource_MISC"]},{"url":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","name":"https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d","tags":["x_refsource_MISC"]},{"url":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0","name":"https://github.com/SignalK/signalk-server/releases/tag/v2.25.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1333","lang":"en","description":"CWE-1333: Inefficient Regular Expression Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-21T00:07:10.371Z"},"source":{"advisory":"GHSA-7gcj-phff-2884","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-21T19:36:30.279521Z","id":"CVE-2026-39320","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-21T19:36:54.787Z"}}]}}}