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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-g9mf-h72j-4rw9 Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 22 Jan 2026 00:00:00 +0900

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

Fri, 16 Jan 2026 21:15:00 +0900

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Thu, 15 Jan 2026 17:15:00 +0900

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

Thu, 15 Jan 2026 05:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

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


Thu, 15 Jan 2026 04:15:00 +0900

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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-14T19:18:24.721Z

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 : Analyzed

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

Modified: 2026-01-21T14:56:59.883

Link: CVE-2026-22036

cve-icon Redhat

Severity : Low

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

Links: CVE-2026-22036 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-01-15T17:03:11Z

Weaknesses