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CVE-2026-46679 libp2p CVE debrief

CVE-2026-46679 is a HIGH severity vulnerability in libp2p's gossipsub. Prior to version 15.0.23, three cooperating omissions allow an unauthenticated single peer to exhaust the Node.js heap of any gossipsub node with default options. This issue has been patched in version 15.0.23.

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's gossipsub with default options are affected by this vulnerability. An unauthenticated peer can exploit this issue to exhaust the Node.js heap.

Technical summary

The vulnerability is caused by three cooperating omissions in @libp2p/gossipsub. This allows an unauthenticated single peer to exhaust the Node.js heap of any gossipsub node with default options.

Defensive priority

HIGH

Recommended defensive actions

  • Update libp2p to version 15.0.23 or later to patch the vulnerability.
  • Review and adjust gossipsub node configurations to prevent exploitation.

Evidence notes

CVE-2026-46679 has a CVSS score of 7.5 and is classified as HIGH severity. The vulnerability was published on 2026-06-10T22:17:00.300Z and modified on 2026-06-11T16:16:23.663Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46679 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46679

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

  • CVE-2026-46679 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46679

    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.