CVE Explorer

CVE-2026-49866

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.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9fdebe46b7183f095da311566265382573a5c48ba1bcc038712bcb3bdd33b16a

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"js-libp2p","vendor":"libp2p","versions":[{"status":"affected","version":"< 16.0.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"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"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions

{"name":"https://github.com/libp2p/js-libp2p/commit/773dd80ded24dbd6b19e675c89fd2f3b45f2d899","tags":["x_refsource_MISC"],"url":"https://github.com/libp2p/js-libp2p/commit/773dd80ded24dbd6b19e675c89fd2f3b45f2d899"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/references/2

{"name":"https://github.com/libp2p/js-libp2p/pull/3520","tags":["x_refsource_MISC"],"url":"https://github.com/libp2p/js-libp2p/pull/3520"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/references/1

{"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"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/references/3

{"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"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a885c86496879476b1e10f8a4b537a0d0ec2c499db32f9f52d94b9eed22bc4a1 · sha256:b95ca91f1a407b31… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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