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CVE-2026-77384— libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion

Quick assessment

Affected
libp2p js-libp2p
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libp2p js-libp2p是libp2p组织的一个模块化点对点网络协议库。 libp2p js-libp2p 2.1.5版本至4.2.9之前版本存在资源管理错误漏洞，该漏洞源于reservation-store.ts中的预留刷新路径重复使用相同的retimeableSignal，并在每次刷新时无条件注册另一个中止监听器。远程对等方可针对同一预留重复发送有效的RESERVE请求，导致@libp2p/circuit-relay-v2中继服务器中监听器和闭包无界增长，造成拒绝服务。

CVSS 7.5 · High EPSS 0.61% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
libp2p js-libp2p >= 2.1.5, < 4.2.9 affected
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I. Basic Information for CVE-2026-77384

Vulnerability Information
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Vulnerability Title
libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a result, a remote peer can repeatedly send valid RESERVE requests for the same reservation, causing unbounded listener and closure growth in @libp2p/circuit-relay-v2 relay servers and leading to denial of service. This issue is fixed in version 4.2.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
libp2p js-libp2p 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libp2p js-libp2p是libp2p组织的一个模块化点对点网络协议库。 libp2p js-libp2p 2.1.5版本至4.2.9之前版本存在资源管理错误漏洞，该漏洞源于reservation-store.ts中的预留刷新路径重复使用相同的retimeableSignal，并在每次刷新时无条件注册另一个中止监听器。远程对等方可针对同一预留重复发送有效的RESERVE请求，导致@libp2p/circuit-relay-v2中继服务器中监听器和闭包无界增长，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
libp2p js-libp2p >= 2.1.5, < 4.2.9 -

II. Public POCs for CVE-2026-77384

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 9203 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-77384

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Patches & Fixes for CVE-2026-77384 (1)

Vendor Advisories for CVE-2026-77384 (1)

Vendor Pages for CVE-2026-77384 (1)

IV. Related Vulnerabilities

Same product: js-libp2p
Same vendor: libp2p
Same weakness: CWE-400

V. Comments for CVE-2026-77384

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