{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86040", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-04T19:29:21.058Z", "datePublished": "2026-09-17T15:20:40.724Z", "dateUpdated": "2026-09-17T19:19:11.341Z"}, "containers": {"cna": {"title": "libp2p: Unbounded RPC decode + synchronous subscription processing in @libp2p/floodsub allows unauthenticated DoS", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-401", "lang": "en", "description": "CWE-401: Missing Release of Memory after Effective Lifetime", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "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"}}], "references": [{"name": "https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cvfg-hcf3-ggwv", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cvfg-hcf3-ggwv"}, {"name": "https://github.com/libp2p/js-libp2p/pull/3568", "tags": ["x_refsource_MISC"], "url": "https://github.com/libp2p/js-libp2p/pull/3568"}, {"name": "https://github.com/libp2p/js-libp2p/commit/fb9e8a76e9ac75924928fae4ce11d00f68320a83", "tags": ["x_refsource_MISC"], "url": "https://github.com/libp2p/js-libp2p/commit/fb9e8a76e9ac75924928fae4ce11d00f68320a83"}, {"name": "https://github.com/libp2p/js-libp2p/releases/tag/floodsub-v11.0.26", "tags": ["x_refsource_MISC"], "url": "https://github.com/libp2p/js-libp2p/releases/tag/floodsub-v11.0.26"}], "affected": [{"vendor": "libp2p", "product": "js-libp2p", "versions": [{"version": "< 11.0.26", "status": "affected"}]}, {"vendor": "@libp2p", "product": "floodsub", "versions": [{"version": "< 11.0.26", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-17T15:20:40.724Z"}, "descriptions": [{"lang": "en", "value": "libp2p is a JavaScript implementation of the libp2p networking stack. Prior to 11.0.26, @libp2p/floodsub accepts unauthenticated RPC frames on /floodsub/1.0.0 through PeerStreams.attachInboundStream in packages/floodsub/src/peer-streams.ts without protobuf element limits, then processRpc and processRpcSubOpt in packages/floodsub/src/floodsub.ts synchronously process the subscriptions array without a per-frame cap. A single bounded-size frame can decode into millions of empty subscription entries that block the event loop, while hundreds of thousands of unique-topic SUBSCRIBE entries allocate PeerSet objects in this.topics that are not removed after peer removal or stop. Empty entries cause CPU exhaustion but do not grow this.topics; persistent memory growth requires unique topics. The subscription path bypasses message signature validation and the message-only processing queue, allowing a remote peer to cause sustained CPU denial of service, memory exhaustion, out-of-memory termination, and node unavailability. The issue is fixed in version 11.0.26."}], "source": {"advisory": "GHSA-cvfg-hcf3-ggwv", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-17T17:06:11.592901Z", "id": "CVE-2026-86040", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-17T19:19:11.341Z"}}]}}

{}

{"affected": [{"affectedData": [{"product": "js-libp2p", "vendor": "libp2p", "versions": [{"status": "affected", "version": "< 11.0.26"}]}, {"product": "floodsub", "vendor": "@libp2p", "versions": [{"status": "affected", "version": "< 11.0.26"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "libp2p is a JavaScript implementation of the libp2p networking stack. Prior to 11.0.26, @libp2p/floodsub accepts unauthenticated RPC frames on /floodsub/1.0.0 through PeerStreams.attachInboundStream in packages/floodsub/src/peer-streams.ts without protobuf element limits, then processRpc and processRpcSubOpt in packages/floodsub/src/floodsub.ts synchronously process the subscriptions array without a per-frame cap. A single bounded-size frame can decode into millions of empty subscription entries that block the event loop, while hundreds of thousands of unique-topic SUBSCRIBE entries allocate PeerSet objects in this.topics that are not removed after peer removal or stop. Empty entries cause CPU exhaustion but do not grow this.topics; persistent memory growth requires unique topics. The subscription path bypasses message signature validation and the message-only processing queue, allowing a remote peer to cause sustained CPU denial of service, memory exhaustion, out-of-memory termination, and node unavailability. The issue is fixed in version 11.0.26."}], "id": "CVE-2026-86040", "lastModified": "2026-09-24T21:19:05.340", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-86040", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-17T17:06:11.592901Z", "version": "2.0.3"}}]}, "published": "2026-09-17T16:18:17.250", "references": [{"source": "[email protected]", "url": "https://github.com/libp2p/js-libp2p/commit/fb9e8a76e9ac75924928fae4ce11d00f68320a83"}, {"source": "[email protected]", "url": "https://github.com/libp2p/js-libp2p/pull/3568"}, {"source": "[email protected]", "url": "https://github.com/libp2p/js-libp2p/releases/tag/floodsub-v11.0.26"}, {"source": "[email protected]", "url": "https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cvfg-hcf3-ggwv"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-401"}, {"lang": "en", "value": "CWE-770"}], "source": "[email protected]", "type": "Secondary"}]}

{}