CVE-2026-45783 HIGH

CVE-2026-45783: libp2p: Unvalidated PUT_VALUE records allow unbounded disk exhaustion on DHT server nodes

Vendor Libp2P
Product js-libp2p
Weakness CWE-20 · Input validation
Published June 10, 2026
Last update June 11, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

libp2p is a JavaScript Implementation of libp2p networking stack. Prior to version 16.2.6, an unauthenticated remote peer can exhaust the disk storage of any @libp2p/kad-dht node running in server mode by sending an unbounded stream of PUT_VALUE messages whose keys bypass all content validation. No credentials, no prior relationship, and no protocol deviation beyond a crafted key are required. The victim node's datastore fills until the host disk is exhausted, making the node unavailable. This issue has been patched in version 16.2.6.

Key dates

02Disclosure timeline

June 10, 2026 CVE published
June 11, 2026 Record updated