Security Bypass Vulnerability in Multiple Mozilla Products (CNVD-2026-13440)

Mozilla Firefox is an open source web browser.Mozilla Firefox ESR is an extended support version of Firefox the web browser.Mozilla Thunderbird is a suite of email client software separate from the Mozilla Application Suite. A security bypass vulnerability exists in several Mozilla products that...

CVE-2026-26309 Envoy has an off-by-one write in JsonEscaper::escapeString()

Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, an off-by-one write in Envoy::JsonEscaper::escapeString can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the...

CVE-2026-26309 Envoy has an off-by-one write in JsonEscaper::escapeString()

Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, an off-by-one write in Envoy::JsonEscaper::escapeString can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the...

GHSA-56CJ-WGG3-X943 Envoy affected by off-by-one write in JsonEscaper::escapeString()

Summary An off-by-one write in Envoy::JsonEscaper::escapeString can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the resulting string is later treated as a C-string. Details The bug is in the control-character...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

PT-2026-24617

Summary An off-by-one write in Envoy::JsonEscaper::escapeString can corrupt std::string null-termination, causing undefined behavior and potentially leading to crashes or out-of-bounds reads when the resulting string is later treated as a C-string. Details The bug is in the control-character...

PT-2026-24378

Name of the Vulnerable Software and Affected Versions Envoy versions prior to 1.34.13 Envoy versions prior to 1.35.8 Envoy versions prior to 1.36.5 Envoy versions prior to 1.37.1 Description Envoy is a high-performance edge/middle/service proxy. An off-by-one write in the...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

RHEL 9 : thunderbird (RHSA-2026:3982)

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:3982 advisory. Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fixes: libvpx: Heap buffer overflow in libvpx CVE-2026-2447 firefox:...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...