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CVE-2026-22036

Good to know:

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Date: January 14, 2026

Undici is an HTTP/1.1 client for Node.js. Prior to 7.18.0 and 6.23.0, the number of links in the decompression chain is unbounded and the default maxHeaderSize allows a malicious server to insert thousands compression steps leading to high CPU usage and excessive memory allocation. This vulnerability is fixed in 7.18.0 and 6.23.0.

Severity Score

Related Resources (5)

https://github.com/nodejs/undici/commit/b04e3cbb569c1596f86c108e9b52c79d8475dcb3
https://github.com/nodejs/undici
https://github.com/nodejs/undici/security/advisories/GHSA-g9mf-h72j-4rw9
https://nvd.nist.gov/vuln/detail/CVE-2026-22036
https://www.mend.io/vulnerability-database/CVE-2026-22036

Severity Score

Weakness Type (CWE)

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade Version

Upgrade to version undici - 7.18.2;undici - 6.23.0;https://github.com/nodejs/undici.git - v7.18.2;https://github.com/nodejs/undici.git - v6.23.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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