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Vulnerability record · CVE-2026-45783 · published 10 June 2026

CVE-2026-45783: Improper input validation vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.50% · top 59.4% CWE-20 · Improper input validationCWE-400 · Uncontrolled resource consumption Deferred
7.5CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Jul 2026Last modified by NVD

Description

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.

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

References

LinkTags
https://github.com/libp2p/js-libp2p/security/advisories/GHSA-32mq-hpph-xfvr
https://github.com/libp2p/js-libp2p/security/advisories/GHSA-32mq-hpph-xfvr

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Source: NIST National Vulnerability Database (record CVE-2026-45783), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.