Memory Allocation with Excessive Size Value

Overview Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value in the WebSocket process. An attacker can cause the server to crash and disrupt service availability for all users by sending a specially crafted binary WebSocket message to the public endpoin...

Memory Allocation with Excessive Size Value

Overview Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value in the WebSocket process. An attacker can cause the server to crash and disrupt service availability for all users by sending a specially crafted binary WebSocket message to the public endpoin...

CVE-2026-5740

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

CVE-2026-5740 Unauthenticated WebSocket binary frame causes denial of service in Mattermost Server

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

CVE-2026-5740 Unauthenticated WebSocket binary frame causes denial of service in Mattermost Server

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

EUVD-2026-31426

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

CVE-2026-5740

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

CVE-2026-5740

Mattermost CVE-2026-5740 is an unauthenticated denial-of-service issue affecting Mattermost Server versions 11.6.x up to 11.6.0, 11.5.x up to 11.5.3, 11.4.x up to 11.4.4, and 10.11.x up to 10.11.14. The root cause is improper validation of msgpack-encoded WebSocket frames before memory allocation...

CVE-2026-5740 Unauthenticated WebSocket binary frame causes denial of service in Mattermost Server

Mattermost versions 11.6.x = 11.6.0, 11.5.x = 11.5.3, 11.4.x = 11.4.4, 10.11.x = 10.11.14 fail to properly validate msgpack-encoded WebSocket frames before memory allocation which allows an unauthenticated remote attacker to crash the server process and cause a full service outage for all users v...

PT-2026-42750

Name of the Vulnerable Software and Affected Versions Mattermost version 11.6.0 Mattermost version 11.5.3 Mattermost version 11.4.4 Mattermost version 10.11.14 Description An issue exists where msgpack-encoded WebSocket frames are not properly validated before memory allocation. This allows an...

Mattermost 安全漏洞

Mattermost is an open-source collaboration platform developed by the American company Mattermost. Vulnerabilities exist in versions of Mattermost 11.6.0 and earlier 11.6.x series, as well as versions prior to 11.5.3 11.5.x series, 11.4.4 and earlier 11.4.x series, and 10.11.14 and earlier 10.11.x...

Unity Linux 20.1060e / 20.1070e Security Update: rubygem-websocket-extensions (UTSA-2026-016659)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016659 advisory. websocket-extensions ruby module prior to 0.1.5 allows Denial of Service DoS via Regex Backtracking. The extension parser may take quadratic time when parsing a head...

CVE-2026-8467

Code Injection vulnerability in phenixdigital phoenixstorybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation. The psb-assign WebSocket event handler in 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handleevent/3...

CVE-2026-8467 Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground

Code Injection vulnerability in phenixdigital phoenixstorybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation. The psb-assign WebSocket event handler in 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handleevent/3...

CVE-2026-8467

Code Injection vulnerability in phenixdigital phoenixstorybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation. The psb-assign WebSocket event handler in 'Elixir.PhoenixStorybook.Story.PlaygroundPreviewLive':handleevent/3...

EEF-CVE-2026-8467 Unauthenticated remote code execution via HEEx template injection in phoenix_storybook playground

Summary Code Injection vulnerability in phenixdigital phoenix\storybook allows unauthenticated remote code execution via unsanitized attribute value interpolation in HEEx template generation. The psb-assign WebSocket event handler in...

Astra Linux – Vulnerability in Tomcat9

DoS attack due to a vulnerability related to incomplete cleanup in Apache Tomcat. WebSocket clients were able to keep WebSocket connections open, leading to increased resource consumption. This issue affects Apache Tomcat versions from 11.0.0-M1 through 11.0.0-M16, from 10.1.0-M1 through 10.1.18,...

Astra Linux – Vulnerability in libvncserver

It was discovered that the websockets.c file in LibVNCServer prior to version 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, resulting in a heap-based buffer overflow...

Astra Linux – Vulnerability in python-eventlet

Eventlet is a concurrent networking library for Python. A WebSocket peer may exhaust memory on the Eventlet side by sending very large WebSocket frames. A malicious peer may also exhaust memory on the Eventlet side by sending highly compressed data frames. A patch in version 0.31.0 restricts...

Astra Linux – Vulnerability in Thunderbird, Firefox

A poorly handled security check during the creation of a WebSocket in a WebWorker caused the Content Security Policy’s connect-src header to be ignored. This could lead to connections being made to restricted origins from within WebWorkers. This vulnerability affects Firefox 109, Firefox ESR 102....