CVE-2026-77384

libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion

Published Aug 24, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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

No solution or workaround provided in the CVE record

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Advisories

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History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion
Weaknesses CWE-400
CWE-772
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

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Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 25, 2026, 7:04 PM
Reserved
Aug 20, 2026, 7:36 PM
Status
Deferred
Published
Aug 24, 2026, 10:17 PM
Modified
Oct 12, 2026, 3:10 PM