---
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'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.