CVE-2026-77384Public exploitNetwork attack vectorHinoki check available

Remote service crash via leaked abort listeners

Published Aug 24, 2026 · Updated Aug 24, 2026

Resource exhaustion in js-libp2p 2.1.5 through 4.2.8 allows remote attackers to crash circuit relay v2 servers via RESERVE requests. The reservation refresh path reuses one retimeableSignal and registers another abort listener and retained closure after every valid refresh. Any peer able to open HOP protocol streams and reserve on a relay can sustain the leak until the Node.js heap is exhausted.

CVSS severity5.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource exhaustion in js-libp2p 2.1.5 through 4.2.8 allows remote attackers to crash circuit relay v2 servers via RESERVE requests. The reservation refresh path reuses one retimeableSignal and registers another abort listener and retained closure after every valid refresh. Any peer able to open HOP protocol streams and reserve on a relay can sustain the leak until the Node.js heap is exhausted.

The record

CVE
CVE-2026-77384
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
libp2p
Product
js-libp2p
Classifications
CWE-772, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 2.1.5, < 4.2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

libp2p · js-libp2pversion=>= 2.1.5, < 4.2.9

Published CVSS scores

5.3libp2p GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
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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