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CVE-2026-85014— undici vulnerable to Denial of Service via WebSocketStream unclean close

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 的实验性 WebSocketStream 客户端在远程对端未执行 WebSocket 关闭握手就直接关闭 TCP 连接时，会导致整个 Node.js 进程崩溃。在异常关闭的情况下，内部 socket 关闭处理器会无条件地对可写流调用 abort，并丢弃返回的 Promise。根据 WHATWG 流标准，对一个已锁定的可写流执行 abort 会返回一个以 TypeError 拒绝（reject）的 Promise。由于应用程序持有该可写流的 writer（这是唯一能向其中写入数据的方式），该拒绝从未被捕

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1029 · Scheduled Transfer

Affected Version Matrix 4

VendorProduct Version RangeStatus
undici undici 7.0.0< 7.29.1 affected
7.29.1 unaffected
8.0.0< 8.10.2 affected
8.10.2 unaffected
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I. Basic Information for CVE-2026-85014

Vulnerability Information
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Vulnerability Title
undici vulnerable to Denial of Service via WebSocketStream unclean close
Source: CVE Program / CVE List V5
Vulnerability Description
undici's experimental WebSocketStream client crashes the whole Node.js process when a remote peer closes the TCP connection without a WebSocket close handshake. On an unclean close the internal socket-close handler calls abort on the writable stream unconditionally and discards the returned promise, but per the WHATWG Streams standard aborting a locked writable returns a promise that rejects with a TypeError. Because the application holds a writer on that writable, which is the only way to write, the rejection is never observed and Node's default unhandled-rejection behavior terminates the process. An untrusted server can therefore crash a client with a single abrupt disconnect, with no authentication and no application mistake. This affects undici versions from 7.0.0 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
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
undici undici 7.0.0 ~ 7.29.1 -

II. Public POCs for CVE-2026-85014

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III. Intelligence Information for CVE-2026-85014

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Vendor Advisories for CVE-2026-85014 (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-2026-18149 5.9 MEDIUM undici vulnerable to Denial of Service via orphaned RetryHandler response body
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

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

V. Comments for CVE-2026-85014

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