CVE-2026-77384

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

State: Published
Severity: 7.5 High
Published: Aug 24, 2026
Updated: Aug 25, 2026
Reserved: Aug 20, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-772 Missing Release of Resource after Effective Lifetime

Affected Products

Product	Versions
js-libp2plibp2p	>= 2.1.5, < 4.2.9Affected

References

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