CVE-2026-109869 undici - Denial of Service

undici 6.23.0 to 6.29.0, 7.18.0 to 7.30.0, and 8.0.0 to 8.12.1 contain a denial of service caused by improper handling of responses with more than five content codings and premature connection close in fetch(), letting remote unauthenticated servers crash the Node.js process, exploit requires malicious server response.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Denial Of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
15 October 2026
Updated
16 October 2026
Weakness
CWE-248

Vendor fix

Upgrade to version 6.29.1, 7.30.1, 8.12.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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