undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression

A flaw was found in undici. A remote attacker can exploit this vulnerability by sending a specially crafted compressed frame, known as a "decompression bomb," during permessage-deflate decompression. The undici WebSocket client does not properly limit the size of decompressed data, leading to...

undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter

A flaw was found in the undici WebSocket client. A remote malicious server can exploit this vulnerability by sending a WebSocket frame with an invalid servermaxwindowbits parameter within the permessage-deflate extension. This improper validation causes the client's Node.js process to terminate,...

undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter

A flaw was found in the undici WebSocket client. A remote malicious server can exploit this vulnerability by sending a WebSocket frame with an invalid servermaxwindowbits parameter within the permessage-deflate extension. This improper validation causes the client's Node.js process to terminate,...

undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter

A flaw was found in the undici WebSocket client. A remote malicious server can exploit this vulnerability by sending a WebSocket frame with an invalid servermaxwindowbits parameter within the permessage-deflate extension. This improper validation causes the client's Node.js process to terminate,...

undici: undici: Denial of Service via unbounded memory consumption during WebSocket permessage-deflate decompression

A flaw was found in undici. A remote attacker can exploit this vulnerability by sending a specially crafted compressed frame, known as a "decompression bomb," during permessage-deflate decompression. The undici WebSocket client does not properly limit the size of decompressed data, leading to...

Important: nodejs20

Issue Overview: Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names e.g., Content-Length and content-length. This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted:...

Amazon Linux 2023 : nodejs24, nodejs24-devel, nodejs24-full-i18n (ALAS2023-2026-1526)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1526 advisory. Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names e.g., Content-Length and content-length. This produces malformed HTTP/1.1 request...

Important: nodejs22

Issue Overview: Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names e.g., Content-Length and content-length. This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted:...

Important: nodejs24

Issue Overview: Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names e.g., Content-Length and content-length. This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted:...

Security Bulletin: Multiple Vulnerabilities in IBM watsonx Code Assistant On Prem

Summary Multiple vulnerabilities were addressed in IBM watsonx Code Assistant On Prem V5.3.1 Vulnerability Details CVEID:CVE-2026-1525 DESCRIPTION: Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names e.g., Content-Length and content-lengt...

GHSA-VRM6-8VPV-QV8Q Undici has Unbounded Memory Consumption in WebSocket permessage-deflate Decompression

Description The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforci...

EUVD-2026-11699

Undici has Unbounded Memory Consumption in WebSocket permessage-deflate Decompression...

Undici has Unbounded Memory Consumption in WebSocket permessage-deflate Decompression

Description The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforci...

EUVD-2026-11704

Undici has Unhandled Exception in WebSocket Client Due to Invalid servermaxwindowbits Validation...

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

Impact The undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the servermaxwindowbits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression....

GHSA-V9P9-HFJ2-HCW8 Undici has Unhandled Exception in WebSocket Client Due to Invalid server_max_window_bits Validation

Impact The undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the servermaxwindowbits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression....

Linux Distros Unpatched Vulnerability : CVE-2026-2229

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the servermaxwindowbits parameter in the...

Linux Distros Unpatched Vulnerability : CVE-2026-1526

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSock...

Improper Handling of Highly Compressed Data (Data Amplification)

Overview org.webjars.npm:undici is an An HTTP/1.1 client, written from scratch for Node.js Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data Data Amplification in the PerMessageDeflate.decompress method of the permessage-deflate extension. An attacker...

Improper Handling of Highly Compressed Data (Data Amplification)

Overview undici is an An HTTP/1.1 client, written from scratch for Node.js Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data Data Amplification in the PerMessageDeflate.decompress method of the permessage-deflate extension. An attacker can cause...