{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-49866", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-01T22:03:19.641Z", "datePublished": "2026-07-08T20:47:09.051Z", "dateUpdated": "2026-07-08T20:47:09.051Z"}, "containers": {"cna": {"title": "libp2p: CPU DoS via oversized IHAVE and IWANT control message arrays", "problemTypes": [{"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-cwc9-cp4j-mcvv", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cwc9-cp4j-mcvv"}, {"name": "https://github.com/libp2p/js-libp2p/pull/3520", "tags": ["x_refsource_MISC"], "url": "https://github.com/libp2p/js-libp2p/pull/3520"}, {"name": "https://github.com/libp2p/js-libp2p/commit/773dd80ded24dbd6b19e675c89fd2f3b45f2d899", "tags": ["x_refsource_MISC"], "url": "https://github.com/libp2p/js-libp2p/commit/773dd80ded24dbd6b19e675c89fd2f3b45f2d899"}, {"name": "https://github.com/libp2p/js-libp2p/releases/tag/gossipsub-v16.0.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/libp2p/js-libp2p/releases/tag/gossipsub-v16.0.0"}], "affected": [{"vendor": "libp2p", "product": "js-libp2p", "versions": [{"version": "< 16.0.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T20:47:09.051Z"}, "descriptions": [{"lang": "en", "value": "libp2p is a JavaScript Implementation of libp2p networking stack. Prior to 16.0.0, @libp2p/gossipsub defaultDecodeRpcLimits set maxIhaveMessageIDs and maxIwantMessageIDs to Infinity, allowing oversized IHAVE and IWANT control message arrays in message/decodeRpc.ts and gossipsub.ts to synchronously iterate roughly 180,000 message IDs per 4 MB frame and block the Node.js event loop. This issue is fixed in version 16.0.0."}], "source": {"advisory": "GHSA-cwc9-cp4j-mcvv", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{}