CVE CVE-2026-49866

CVE-2026-49866

Node.js

Severity: HIGH
CVSS: 7.5CVSS
Published: 2026-07-08
Last modified: 2026-07-08
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-770

Description

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.

References

https://github.com/libp2p/js-libp2p/commit/773dd80ded24dbd6b19e675c89fd2f3b45f2d899
https://github.com/libp2p/js-libp2p/pull/3520
https://github.com/libp2p/js-libp2p/releases/tag/gossipsub-v16.0.0
https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cwc9-cp4j-mcvv

Summary

Description

References