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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

Published: Jan 14, 2026Updated: Jan 22, 2026 Sources: CVE List NVD GHSACWE-770
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.4%
Top 65.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

undicinodejsOSS Libraries
undicinpmOSS Libraries
nodejsoss-projectUSOSS Librariesaka node.js, node
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/nodejs/undici/commit/b04e3cbb569c1596f86c108e9b52c79d8475dcb3
github.com
https://github.com/nodejs/undici/security/advisories/GHSA-g9mf-h72j-4rw9
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-22036
nvd.nist.gov
and 1 more references View all →

Timeline

Published
Jan 14, 2026
Last Updated
Jan 22, 2026

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