{"id":"CVE-2026-103936","title":"libp2p is a JavaScript implementation of the libp2p networking stack","summary":"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, protoc…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-248","CWE-755"],"vendor":"libp2p","product":"js-libp2p","affected":["js-libp2p < 3.3.7","webrtc < 6.0.28"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T18:17:22.433","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103936","references":[{"url":"https://github.com/libp2p/js-libp2p/commit/68794c8e2e67d5f38da59e379dc051b2789e46f6","label":"security-advisories@github.com"},{"url":"https://github.com/libp2p/js-libp2p/pull/3584","label":"security-advisories@github.com"},{"url":"https://github.com/libp2p/js-libp2p/releases/tag/webrtc-v6.0.28","label":"security-advisories@github.com"},{"url":"https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x3m2-6mg8-vj7f","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-15T18:23:58.444Z","slug":"CVE-2026-103936","body":"## Overview\n\nlibp2p 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}