CVE-2026-85014Network attack vectorHinoki check available

Process crash via unhandled stream-abort rejection

Published Sep 4, 2026 · Updated Sep 4, 2026

Denial of service in Node.js Undici 7.0.0 through 7.29.0 and 8.0.0 through 8.10.1 allows remote attackers to crash clients via abrupt disconnects. On an unclean WebSocketStream close, the socket-close handler calls abort() on a writer-locked writable and discards the rejecting promise, leaving a TypeError unhandled. An unauthenticated malicious or compromised WebSocket server can terminate a Node.js client after one abrupt TCP disconnect when the application uses WebSocketStream and holds its required writer.

CVSS severity5.9
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Node.js Undici 7.0.0 through 7.29.0 and 8.0.0 through 8.10.1 allows remote attackers to crash clients via abrupt disconnects. On an unclean WebSocketStream close, the socket-close handler calls abort() on a writer-locked writable and discards the rejecting promise, leaving a TypeError unhandled. An unauthenticated malicious or compromised WebSocket server can terminate a Node.js client after one abrupt TCP disconnect when the application uses WebSocketStream and holds its required writer.

The record

CVE
CVE-2026-85014
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Node.js
Product
Undici
Classifications
CWE-248, CWE-754, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=7.0.0 <7.29.1
  2. Affected versionversion=8.0.0 <8.10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Undiciversion=7.0.0 <7.29.1; version=8.0.0 <8.10.2

Published CVSS scores

5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
CWE-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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