High severity · published Jan 14, 2026
CVE-2026-22036
Undici is an HTTP/1.1 client for Node.js
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UN
Undici · Nodejs
before 6.23.0; 7.0.0 before 7.18.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-22036
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-22036
Patch
https://github.com/nodejs/undici/commit/b04e3cbb569c1596f86c108e9b52c79d8475dcb3
Vendor Advisory
https://github.com/nodejs/undici/security/advisories/GHSA-g9mf-h72j-4rw9
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