CVE-2026-18149— undici vulnerable to Denial of Service via orphaned RetryHandler response body
Quick assessment
Affected
undici undici
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
undici 的重试处理程序可能导致已暴露的响应体永远处于挂起状态。当服务器返回一个声明了 的成功响应，但仅发送了部分响应体并关闭连接时，重试处理程序会重试该请求。如果重试后返回一个不可重试的状态码（如 400），处理程序会将新的响应向下传递，并替换其内部的响应流；然而，应用程序仍持有的原始响应体既未结束也未被销毁。因此，读取该响应体的调用永远不会完成，且配置的响应体超时会失效，因为该超时的计时器绑定在连接解析器上，而非孤立出的响应体上。由攻击者控制的服务器可以通过两个简短的响应触发此问题，而无需保持连接打开。重复
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-18149
Vulnerability Information
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Vulnerability Title
undici vulnerable to Denial of Service via orphaned RetryHandler response body
Source: CVE Program / CVE List V5
Vulnerability Description
undici's retry handler can leave an already-exposed response body pending forever. When a server returns a successful response that declares a Content-Length, sends only part of the body, and closes the connection, the retry handler retries the request. If the retry returns a non-retryable status such as 400, the handler forwards that new response downstream and replaces its internal response stream, but the original response body that the application still holds is never ended or destroyed. As a result calls that read that body never settle, and the configured body timeout does not fire because its timer is tied to the connection parser rather than the orphaned body. An attacker-controlled server can trigger this with two short responses without keeping a connection open, and repeated requests accumulate pending promises and streams that can exhaust application concurrency or memory. This affects undici versions from 7.11.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-18149
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-18149 (1)
Same Patch Batch · undici · 2026-09-04 · 11 CVEs total
| CVE-2026-19534 | 7.5 HIGH | undici vulnerable to Denial of Service via unrequested WebSocket subprotocol |
| CVE-2026-85152 | 7.4 HIGH | undici vulnerable to cross-origin cache poisoning via missing origin isolation in intercep |
| CVE-2026-84961 | 7.4 HIGH | undici vulnerable to TLS certificate validation bypass via dropped connect options in Bala |
| CVE-2026-84933 | 6.5 MEDIUM | undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches |
| CVE-2026-85024 | 5.9 MEDIUM | undici vulnerable to Denial of Service via unhandled error in WebSocket permessage-deflate |
| CVE-2026-85014 | 5.9 MEDIUM | undici vulnerable to Denial of Service via WebSocketStream unclean close |
| CVE-2026-84890 | 5.9 MEDIUM | undici vulnerable to Denial of Service via unbounded decompression of compressed responses |
| CVE-2026-85008 | 3.7 LOW | undici vulnerable to caching and replay of unsafe HTTP method responses |
| CVE-2026-84947 | 3.7 LOW | undici vulnerable to response truncation via oversized chunked responses in the dump inter |
| CVE-2026-18540 | 3.7 LOW | undici vulnerable to downstream response splitting via retry interceptor |
IV. Related Vulnerabilities
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V. Comments for CVE-2026-18149
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