{"id":"CVE-2026-77384","state":"PUBLISHED","title":"libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion","description":"libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a result, a remote peer can repeatedly send valid RESERVE requests for the same reservation, causing unbounded listener and closure growth in @libp2p/circuit-relay-v2 relay servers and leading to denial of service. This issue is fixed in version 4.2.9.","publishedAt":"2026-08-24T21:06:39.909Z","updatedAt":"2026-08-25T19:04:25.322Z","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":["libp2p js-libp2p"],"affected":[{"vendor":"libp2p","product":"js-libp2p","versions":[{"version":">= 2.1.5, < 4.2.9","status":"affected"}]}],"references":["https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7","https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f3590e4af51a1f5f7de56fffa5804d","https://github.com/libp2p/js-libp2p/releases/tag/circuit-relay-v2-v4.2.9"],"weaknesses":["CWE-400","CWE-772"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77384.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77384","state":"PUBLISHED","datePublished":"2026-08-24T21:06:39.909Z","dateUpdated":"2026-08-25T19:04:25.322Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T19:36:13.806Z"},"containers":{"cna":{"title":"libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion","descriptions":[{"lang":"en","value":"libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a result, a remote peer can repeatedly send valid RESERVE requests for the same reservation, causing unbounded listener and closure growth in @libp2p/circuit-relay-v2 relay servers and leading to denial of service. This issue is fixed in version 4.2.9."}],"affected":[{"vendor":"libp2p","product":"js-libp2p","versions":[{"version":">= 2.1.5, < 4.2.9","status":"affected"}]}],"references":[{"url":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7","name":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f3590e4af51a1f5f7de56fffa5804d","name":"https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f3590e4af51a1f5f7de56fffa5804d","tags":["x_refsource_MISC"]},{"url":"https://github.com/libp2p/js-libp2p/releases/tag/circuit-relay-v2-v4.2.9","name":"https://github.com/libp2p/js-libp2p/releases/tag/circuit-relay-v2-v4.2.9","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-772","lang":"en","description":"CWE-772: Missing Release of Resource after Effective Lifetime","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-24T21:06:39.909Z"},"source":{"advisory":"GHSA-x787-gh7p-hmq7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T19:03:46.256710Z","id":"CVE-2026-77384","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":"2026-08-25T19:04:25.322Z"}}]}}}