7.5

CVE-2026-45783: libp2p js-libp2p Improper Input Validation

CVSS: 7.5v3.1HighDeferred
AliasesGHSA-32mq-hpph-xfvr
Published 10-06-2026Last modified 11-06-2026
Open JSON

Vulnerability summary

CVE-2026-45783 is a high (CVSS 7.5) Improper Input Validation vulnerability in libp2p js-libp2p. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · +0.15 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-06-2026
    PublishedVulnerability first disclosed.
  2. 11-06-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.15 pp

From 0.35% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

@libp2p1 product
  • kad-dht< 16.2.6
Libp2p1 product

2 vendors · 2 products

References

3 links