CVE-2026-22036

MEDIUM

Undici < 6.23.0 and 7.0.0-7.17.2 - Denial of Service via Decompression Chain Exhaustion

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-22036. PoCs published by ctkqiang.

AI-analyzed exploit summary This repository contains a functional proof-of-concept for CVE-2026-22036, demonstrating a DoS vulnerability via a maliciously crafted 'Content-Encoding' header. The server generates an excessively large header to trigger resource exhaustion in the client, while the client and monitor scripts measure the impact.

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.

Exploits (1)

github WORKING POC 4 stars
by ctkqiang · gopoc
https://github.com/ctkqiang/CVE-Exploits/tree/main/CVE-2026-22036

This repository contains a functional proof-of-concept for CVE-2026-22036, demonstrating a DoS vulnerability via a maliciously crafted 'Content-Encoding' header. The server generates an excessively large header to trigger resource exhaustion in the client, while the client and monitor scripts measure the impact.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: undici (HTTP client library)
No auth needed
Prerequisites: Node.js environment · undici library installed
devstral-2 · analyzed Feb 27, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 5.9
EPSS 0.0001
EPSS Percentile 2.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (2)
nodejs/undici < 6.23.0
npm/undici 7.0.0 - 7.18.2npm
Published Jan 14, 2026
Tracked Since Feb 18, 2026