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Advisory record · GHSA-xjj6-f33q-929c

undici vulnerable to Denial of Service via unhandled error on excessive content-encodings

CVSS 7.5 HighEPSS 0.0034 · 28th percentile

Published by the GitHub Advisory Database at 23 Oct 2026, 22:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
undicinpm>=6.23.0, <6.29.1 || >=7.18.0, <7.30.1 || >=8.0.0, <8.12.26.29.1, 7.30.1, 8.12.2
Identifiers
GHSA-xjj6-f33q-929c · CVE-2026-109869
Weakness (CWE)
CWE-248 · CWE-459
Tags
Published
23 Oct 2026
Updated
23 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The npm package undici (6.23.0 to before 6.29.1, 7.18.0 to before 7.30.1, 8.0.0 to before 8.12.2) can crash a Node.js process through fetch(). A remote, unauthenticated server can trigger this with one response that has more than five content codings and closes early, even if the application catches the rejection. Upgrade to 6.29.1, 7.30.1, or 8.12.2; no workarounds are listed.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (openjs)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.