CVE-2026-103936
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk43th percentile - higher than 43% of all known CVEs
Summary
In @libp2p/webrtc prior to 6.0.28, the webRTCDirect() Node.js listener processes unauthenticated STUN Binding Requests before PeerId authentication, Noise, muxing, and protocol negotiation. The packet-controlled request.ufrag is forwarded to DirectRTCPeerConnection.setLocalDescription and reused as an ICE password without validating its required length and character set, causing an uncaught native invalid_argument and process abort with SIGABRT.
Risk Assessment
A single remote UDP packet can terminate the process (denial of service). The confirmed impact is process termination only — no memory corruption or code execution has been demonstrated.
Recommendation
Update @libp2p/webrtc to version 6.0.28 or later.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

