Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-85014

CVE-2026-85014HIGH

undici vulnerable to Denial of Service via WebSocketStream unclean close

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0037   28.3     —

AFFECTED
  Product  Versions  Fixed
  undici   7.0.0 –   7.29.1

TIMELINE
  Sep 2   Reserved by openjs
  Sep 4   Published (CNA: openjs)
  Sep 15  RESCORED — CVE-2026-85014 (undici). CVSS 5.9 → 7.5 (NVD).

CWE-248, CWE-754 · CNA: openjs · CVSS v3.1 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 2, 2026	Reserved	Reserved by openjs
September 4, 2026	Published	Published (CNA: openjs)
September 15, 2026	RESCORED	RESCORED — CVE-2026-85014 (undici). CVSS 5.9 → 7.5 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
undici	undici	—	7.0.0	7.29.1

Weaknesses

CWE-248 · CWE-754

References (2)

https://cna.openjsf.org/security-advisories.html [Third Party Advisory]
https://github.com/nodejs/undici/security/advisories/GHSA-rx4f-c7p8-82vq [Vendor Advisory]

Authoritative record: CVE-2026-85014 at cve.org

Vendors: undici

Weaknesses: CWE-248 · CWE-754

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-85014 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.