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CVE-2026-109855— undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake

一分钟漏洞结论

影响对象
undici undici
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

undici is an HTTP client library for Node.js. In versions 8.11.0 and 8.11.1, its experimental WebSocket client, which is enabled by default when HTTP/2 is allowed, mishandles a failed WebSocket handshake over HTTP/2: the request is already marked completed, so

CVSS 7.5 · High
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一、 漏洞 CVE-2026-109855 基础信息

漏洞信息

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Vulnerability Title
undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake
来源: CVE Program / CVE List V5
Vulnerability Description
undici is an HTTP client library for Node.js. In versions 8.11.0 and 8.11.1, its experimental WebSocket client, which is enabled by default when HTTP/2 is allowed, mishandles a failed WebSocket handshake over HTTP/2: the request is already marked completed, so the abort becomes a no-op and the underlying HTTP/2 stream is left open with no error listener. When a malicious server then destroys the connection, the orphaned stream emits an unhandled error and the Node.js process exits. A remote, unauthenticated server can therefore crash any client that opens a WebSocket to it over HTTP/2, resulting in a denial of service. The issue is fixed in undici 8.11.2, and users should upgrade to 8.11.2 or later. As a workaround, set allowH2 to false to disable HTTP/2 for WebSocket connections, or avoid opening WebSocket connections to untrusted servers.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
undici undici 8.11.0 ~ 8.11.2 -

二、漏洞 CVE-2026-109855 的公开POC

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三、漏洞 CVE-2026-109855 的情报信息

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CVE-2026-109855 其他参考 (1)

IV. Related Vulnerabilities

Same product: undici
Same vendor: undici
Same weakness: CWE-248

V. Comments for CVE-2026-109855

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