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CVE-2026-22036— Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion

Quick assessment

Affected
nodejs undici
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

undici是Node.js开源的一个HTTP/1.1客户端。 undici 7.18.0之前版本和6.23.0之前版本存在安全漏洞，该漏洞源于解压缩链中链接数量无限制，可能导致高CPU使用率和内存过度分配。

CVSS 5.9 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-22036

Vulnerability Information
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Vulnerability Title
Undici has an unbounded decompression chain in HTTP responses on Node.js Fetch API via Content-Encoding leads to resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
undici 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
undici是Node.js开源的一个HTTP/1.1客户端。 undici 7.18.0之前版本和6.23.0之前版本存在安全漏洞，该漏洞源于解压缩链中链接数量无限制，可能导致高CPU使用率和内存过度分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodejs undici < 6.23.0 -

II. Public POCs for CVE-2026-22036

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III. Intelligence Information for CVE-2026-22036

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Vendor Advisories for CVE-2026-22036 (1)

IV. Related Vulnerabilities

Same product: undici
Same vendor: nodejs
Same weakness: CWE-770

V. Comments for CVE-2026-22036

Anonymous User
2026-01-15 06:08:07

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