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

7.5HIGH

Key Information:

Vendor

Libp2p

Status
Js-libp2p
Vendor
CVE Published:
10 June 2026

What is CVE-2026-45783?

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 Version(s)

js-libp2p < 16.2.6

References

https://github.com/libp2p/js-libp2p/security/advisories/G...
x_refsource_CONFIRM

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

.