---
id: CVE-2026-77384
title: libp2p is a JavaScript implementation of the libp2p networking stack
summary: >-
  libp2p is a JavaScript implementation of the libp2p networking stack. Prior to
  version 4.2.9, the reservation refresh path in reservation-store.ts reuses the
  same retimeableSignal but unconditionally registers another abort listener on
  e…
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-400
  - CWE-772
published: '2026-08-24'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:07:31.353'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77384'
references:
  - url: >-
      https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f3590e4af51a1f5f7de56fffa5804d
    label: security-advisories@github.com
  - url: 'https://github.com/libp2p/js-libp2p/releases/tag/circuit-relay-v2-v4.2.9'
    label: security-advisories@github.com
  - url: >-
      https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7
    label: security-advisories@github.com
  - url: >-
      https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00609
epssPercentile: 0.46843
ingestedAt: '2026-09-09T21:22:45.549Z'
---

## Overview

libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a result, a remote peer can repeatedly send valid RESERVE requests for the same reservation, causing unbounded listener and closure growth in @libp2p/circuit-relay-v2 relay servers and leading to denial of service. This issue is fixed in version 4.2.9.

## Remediation

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