CVE-2026-22036Network attack vector

Client denial of service via unbounded decompression chain

Published Jan 14, 2026 · Updated Jan 14, 2026

Resource exhaustion in Node.js Undici before 6.23.0 and 7.0.0 through 7.18.1 allows remote attackers to disrupt clients via HTTP responses. DecompressHandler#createDecompressionChain splits the Content-Encoding header and creates one decompressor per entry without limiting the chain length. A client must fetch from a malicious server; thousands of encodings can consume excessive CPU and memory until the process becomes unavailable.

CVSS severity5.9
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Node.js Undici before 6.23.0 and 7.0.0 through 7.18.1 allows remote attackers to disrupt clients via HTTP responses. DecompressHandler#createDecompressionChain splits the Content-Encoding header and creates one decompressor per entry without limiting the chain length. A client must fetch from a malicious server; thousands of encodings can consume excessive CPU and memory until the process becomes unavailable.

The record

CVE
CVE-2026-22036
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
Node.js
Product
Undici
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.23.0
  2. Affected versionversion=>= 7.0.0, < 7.18.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Undiciversion=< 6.23.0; version=>= 7.0.0, < 7.18.2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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