CVE-2026-45783: LIBP2P Js-LIBP2P

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• LIBP2P Js-LIBP2P: before 16.2.6 (fixed in 16.2.6)

Published 2026-06-10. Last modified 2026-07-23.