Denial of Service Vulnerability in libp2p Networking Stack by libp2p
CVE-2026-77384

7.5HIGH

Key Information:

Vendor

Libp2p

Status
Js-libp2p
Vendor
CVE Published:
24 August 2026

What is CVE-2026-77384?

The libp2p JavaScript implementation is exposed to a denial of service vulnerability due to improper handling of the reservation refresh mechanism in reservation-store.ts prior to version 4.2.9. An attacker can exploit this by sending multiple valid RESERVE requests for the same reservation, leading to unbounded listener and closure growth on the @libp2p/circuit-relay-v2 relay servers. This behavior can interfere with service availability and degrade performance, affecting overall network operations. Users are advised to update to version 4.2.9 or later to mitigate this issue.

Affected Version(s)

js-libp2p >= 2.1.5, < 4.2.9

References

https://github.com/libp2p/js-libp2p/security/advisories/G...
x_refsource_CONFIRM
https://github.com/libp2p/js-libp2p/commit/4bb8fbe8d3f359...
x_refsource_MISC
https://github.com/libp2p/js-libp2p/releases/tag/circuit-...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.