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Undici has Unhandled Exception in WebSocket Client Due to Invalid server_max_window_bits Validation

🗓️ 13 Mar 2026 20:41:41Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 6 Views

Undici WebSocket client crashes on invalid server_max_window_bits during permessage-deflate, causing denial of service.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: IBM App Connect Enterprise is vulnerable to multiple vulnerabilities due to node modules Hono and Undici
30 Mar 202612:20
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in IBM Bob
2 Jun 202614:29
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in IBM watsonx Code Assistant On Prem
23 Mar 202615:13
–ibm
IBM Security Bulletins		Security Bulletin: Multiple security vulnerabilities in IBM Business Automation Manager Open Editions
31 Mar 202612:19
–ibm
IBM Security Bulletins		Security Bulletin: Platform Navigator in IBM Cloud Pak for Integration is vulnerable to multiple vulnerabilities in undici
6 May 202611:30
–ibm
IBM Security Bulletins		Security Bulletin: The Analyst Workflow App for IBM QRadar SIEM is vulnerable to using components with known vulnerabilities
22 May 202613:31
–ibm
ATTACKERKB		CVE-2026-2229
12 Mar 202620:27
–attackerkb
Tenable Nessus		Amazon Linux 2023 : nodejs20, nodejs20-devel, nodejs20-full-i18n (ALAS2023-2026-1524)
1 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : nodejs22, nodejs22-devel, nodejs22-full-i18n (ALAS2023-2026-1525)
1 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : nodejs24, nodejs24-devel, nodejs24-full-i18n (ALAS2023-2026-1526)
1 Apr 202600:00
–nessus
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Vulners
Node
nodejsundiciRange7.0.0–7.24.0npm
OR
nodejsundiciRange<6.24.0npm

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13 Mar 2026 20:41Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.5
EPSS0.00175
SSVC
CWE-248
undiciwebsocketpermessage deflateserver max window bitsdenial of servicerange error
6