CVE-2026-22036
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.
Affected Packages
https://github.com/nodejs/undici.git (GITHUB):
Affected version(s) >=v7.0.0 <v7.18.2Fix Suggestion:
Update to version v7.18.2https://github.com/nodejs/undici.git (GITHUB):
Affected version(s) >=v1.0.0 <v6.23.0Fix Suggestion:
Update to version v6.23.0undici (NPM):
Affected version(s) >=7.0.0 <7.18.2Fix Suggestion:
Update to version 7.18.2undici (NPM):
Affected version(s) >=0.1.0 <6.23.0Fix Suggestion:
Update to version 6.23.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.02
