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CVE-2026-45783 libp2p CVE debrief

CVE-2026-45783 is a HIGH severity vulnerability in libp2p, a JavaScript Implementation of libp2p networking stack. An unauthenticated remote peer can exhaust a @libp2p/kad-dht node's disk storage by sending an unbounded stream of PUT_VALUE messages with crafted keys, making the node unavailable. This issue was patched in version 16.2.6.

Vendor
libp2p
Product
js-libp2p
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of libp2p, particularly those running @libp2p/kad-dht nodes in server mode, should be aware of this vulnerability and take steps to update to version 16.2.6 or later.

Technical summary

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.

Defensive priority

HIGH

Recommended defensive actions

  • Update libp2p to version 16.2.6 or later.
  • Restrict access to @libp2p/kad-dht nodes in server mode to trusted peers only.

Evidence notes

This vulnerability was patched in version 16.2.6. For more information, see [ref-4](https://github.com/libp2p/js-libp2p/security/advisories/GHSA-32mq-hpph-xfvr).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45783 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45783

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45783 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45783

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.