{"id":"CVE-2026-86040","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-86040","summary":"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…","details":"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.","published":"2026-09-17T15:20:40.724Z","modified":"2026-09-17T15:20:40.724Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/libp2p/js-libp2p/pull/3568","label":"libp2p/js-libp2p#3568"},"references":[{"type":"WEB","url":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-cvfg-hcf3-ggwv"},{"type":"WEB","url":"https://github.com/libp2p/js-libp2p/pull/3568"},{"type":"WEB","url":"https://github.com/libp2p/js-libp2p/commit/fb9e8a76e9ac75924928fae4ce11d00f68320a83"},{"type":"WEB","url":"https://github.com/libp2p/js-libp2p/releases/tag/floodsub-v11.0.26"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-17T15:20:40.724Z"}}