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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Nodejs
  • Undici

Configuration 1 [-]

OR cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

No data.

References
Link Providers
https://github.com/nodejs/undici/commit/b04e3cbb569c1596f86c108e9b52c79d8475dcb3 cve-icon cve-icon cve-icon
https://github.com/nodejs/undici/security/advisories/GHSA-g9mf-h72j-4rw9 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-22036 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-22036 cve-icon
History

Thu, 22 Jan 2026 23:00:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

 cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Wed, 21 Jan 2026 15:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

Fri, 16 Jan 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Low

Thu, 15 Jan 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Nodejs
Nodejs undici
Vendors & Products Nodejs
Nodejs undici

Wed, 14 Jan 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 14 Jan 2026 19:15:00 +0000

Type Values Removed Values Added
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.
Title Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-22T20:17:20.208Z

Reserved: 2026-01-05T22:30:38.719Z

Link: CVE-2026-22036

cve-icon Vulnrichment

Updated: 2026-01-14T19:18:13.756Z

cve-icon NVD

Status : Modified

Published: 2026-01-14T19:16:47.833

Modified: 2026-01-22T21:15:50.070

Link: CVE-2026-22036

cve-icon Redhat

Severity : Low

Publid Date: 2026-01-14T19:07:13Z

Links: CVE-2026-22036 - Bugzilla