CVE-2026-46679Public exploitNetwork attack vector

Unauthenticated heap exhaustion via unique-topic subscription floods

Published Jun 10, 2026 · Updated Jun 10, 2026

Uncontrolled resource consumption in @libp2p/gossipsub before 15.0.23 allows remote attackers to crash Node.js peers with subscription floods. The decoder accepts unlimited subscription entries, handleReceivedSubscription creates an unbounded topic Map entry for each unique string, and removePeer retains empty Sets. Any node using default options and accepting inbound gossipsub connections is exposed; repeated frames exhaust the heap and crash the process.

CVSS severity7.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in @libp2p/gossipsub before 15.0.23 allows remote attackers to crash Node.js peers with subscription floods. The decoder accepts unlimited subscription entries, handleReceivedSubscription creates an unbounded topic Map entry for each unique string, and removePeer retains empty Sets. Any node using default options and accepting inbound gossipsub connections is exposed; repeated frames exhaust the heap and crash the process.

The record

CVE
CVE-2026-46679
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
libp2p
Product
js-libp2p
Classifications
CWE-401, CWE-20, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 15.0.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

libp2p · js-libp2pversion=< 15.0.23

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
CWE-20Improper Input Validation
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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