{"id":"CVE-2026-103936","published":"2026-10-15T18:17:22.433","lastModified":"2026-10-16T20:04:29.760","description":"libp2p is a JavaScript implementation of the libp2p networking stack. Prior to 6.0.28, the @libp2p/webrtc webRTCDirect() Node.js listener processes unauthenticated STUN Binding Requests before PeerId authentication, Noise, muxing, protocol negotiation, connection creation, or connection-manager admission. The listener in packages/transport-webrtc/src/private-to-public/utils/stun-listener.ts forwards the packet-controlled request.ufrag into DirectRTCPeerConnection.setLocalDescription, where the value is reused as an ICE password without validating its required length and character set. A short credential causes node-datachannel or libdatachannel to raise an uncaught native invalid_argument and abort the process with SIGABRT, allowing a single remote UDP packet to deny service. The confirmed impact is process termination only, with no demonstrated memory corruption, code execution, browser impact, confidentiality impact, integrity impact, or connection-limit bypass. This issue is fixed in version 6.0.28.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-248","CWE-755"],"vendors":[],"products":[],"references":[{"url":"https://github.com/libp2p/js-libp2p/commit/68794c8e2e67d5f38da59e379dc051b2789e46f6","tags":[]},{"url":"https://github.com/libp2p/js-libp2p/pull/3584","tags":[]},{"url":"https://github.com/libp2p/js-libp2p/releases/tag/webrtc-v6.0.28","tags":[]},{"url":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x3m2-6mg8-vj7f","tags":[]}],"exploitRefs":[{"url":"https://github.com/libp2p/js-libp2p/commit/68794c8e2e67d5f38da59e379dc051b2789e46f6","tags":[]},{"url":"https://github.com/libp2p/js-libp2p/pull/3584","tags":[]},{"url":"https://github.com/libp2p/js-libp2p/releases/tag/webrtc-v6.0.28","tags":[]},{"url":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x3m2-6mg8-vj7f","tags":[]}],"hasPoc":true,"ai":null}