EUVD-2026-37747

undici WebSocket client vulnerable to denial of service via fragment count bypass...

UBUNTU-CVE-2026-9675

Impact: The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream many small fragments that each pass per-frame validation but collectively exceed the configured limit, causin...

CVE-2026-9675

The CVE-2026-9675 issue affects the undici WebSocket client (new WebSocket(...)) where per-frame maxPayloadSize is enforced but the cumulative size of fragmented, uncompressed messages is not. A attacker-controlled WebSocket endpoint can stream many small fragments that pass per-frame validation ...

CVE-2026-12151

The CVE affects the undici WebSocket client (and WebSocketStream API) where maxPayloadSize is enforced per-frame but there is no limit on the number of fragments in a message. A malicious server can send many small or empty continuation frames, each passing validation, causing unbounded memory gr...

CVE-2026-12151

Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size...

PT-2026-50470

Name of the Vulnerable Software and Affected Versions undici version 8.1.0 Description The undici WebSocket client enforces maxPayloadSize on a per-frame basis but fails to enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream numerous small...

AlmaLinux 9 : nodejs:24 (ALSA-2026:7350)

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:7350 advisory. nodejs: Nodejs denial of service CVE-2026-21637 brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion CVE-2026-25547...

Important: Red Hat Security Advisory: nodejs:22 security update

An update for the nodejs:22 module is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is...

MiracleLinux 8 : nodejs:22 (AXSA:2026-432:01)

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-432:01 advisory. brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion CVE-2026-25547 minimatch: minimatch: Denial of Service via...

ALSA-2026:7670 Important: nodejs:24 security update

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language. Security Fixes: nodejs: Nodejs denial of service CVE-2026-21637 minimatch: minimatch: Denial of Service via specially crafted glob patterns CVE-2026-26996 undici:...

RockyLinux 10 : nodejs22 (RLSA-2026:7080)

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:7080 advisory. brace-expansion: brace-expansion: Denial of Service via unbounded brace range expansion CVE-2026-25547 minimatch: minimatch: Denial of Service via...

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....

Undici: Malicious WebSocket 64-bit length overflows parser and crashes the client

Impact A server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7.24.0 and v6.24....

Linux Distros Unpatched Vulnerability : CVE-2026-1528

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up...

CVE-2026-2229

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,...

CVE-2026-2229

ImpactThe 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. ...

CVE-2026-2229

ImpactThe 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. ...

CVE-2026-1526

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 enforcing any limit...

CVE-2026-2229

The CVE affects the undici WebSocket client. It arises from improper validation of the server_max_window_bits parameter in the permessage-deflate extension: isValidClientWindowBits() only checks ASCII digits and not the 8–15 range, and createInflateRaw() is not wrapped in a try-catch. A malicious...

CVE-2026-1526

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 enforcing any limit...