High 7.5Published Aug 24, 2026

CVE-2026-77384libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion

Updated under an hour ago (2026-10-19 07:00 UTC)

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It affects libp2p js-libp2p. Add what you run to find out whether that includes you.

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Every CVE for libp2p js-libp2p

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-772
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

libp2p js-libp2p libp2p:js_libp2p (from the name)	from 2.1.5, < 4.2.9	CNA record

References

https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7x-refsource-confirm
https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f3590e4af51a1f5f7de56fffa5804dx-refsource-misc
https://github.com/libp2p/js-libp2p/releases/tag/circuit-relay-v2-v4.2.9x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.