Vulnerability details

CVE-2026-77384

libp2p js-libp2p

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

CVSS 3.1

7.5High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
libp2p	js-libp2p	>= 2.1.5, < 4.2.9	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f3590e4af51a1f5f7de56fffa5804d x_refsource_MISC
https://github.com/libp2p/js-libp2p/releases/tag/circuit-relay-v2-v4.2.9 x_refsource_MISC
https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7 x_refsource_CONFIRM

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Details

Published: 2026-08-25
Last updated: 2026-08-25
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.6%

Probability of exploitation in 30 days

49.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

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