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ALSA-2025:10072 — Important: firefox security update

Affected: AlmaLinux:9: firefox, AlmaLinux:9: firefox-x11

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

* firefox: Content-Disposition header ignored when a file is included in an embed or object tag (CVE-2025-6430) * firefox: Use-after-free in FontFaceSet (CVE-2025-6424) * firefox: Incorrect parsing of URLs could have allowed embedding of youtube.com (CVE-2025-6429) * firefox: The WebCompat WebExtension shipped with Firefox exposed a persistent UUID (CVE-2025-6425)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2025-07582

certfr-2025-avi-0536 — De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un atta…

certfr-2025-avi-0536

cnvd-2025-15493

EUVD-2026-290785

fkie_cve-2025-6430

When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file was included via a `<embed>` or `<object>` tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

GHSA-fvqv-c5hj-jcrp

OESA-2025-1717 — firefox security update

Affected: openEuler:22.03-LTS-SP3: firefox

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. %if 0 %global moz_debug_prefix /lib/debug %global moz_debug_dir /lib/debug/ %global uname_m %(uname -m) %global symbols_file_name -.en-US.-%(uname.crashreporter-symbols.zip %global symbols_file_path /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip %global _find_debuginfo_opts -p /lib/debug//-.en-US.-%(uname.crashreporter-symbols.zip -o debugcrashreporter.list %global crashreporter_pkg_name mozilla-crashreporter--debuginfo Security Fix(es):

A vulnerability was found in Mozilla Firefox up to 139 (Web Browser). It has been rated as critical.Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.Impacted is confidentiality, integrity, and availability.Upgrading to version 140 eliminates this vulnerability.(CVE-2025-6424)

An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.(CVE-2025-6425)

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed…

openSUSE-SU-2025:15216-1 — firefox-esr-128.12.0-1.1 on GA media

firefox-esr-128.12.0-1.1 on GA media

RHSA-2025:10073 — Red Hat Security Advisory: firefox security update

firefox: thunderbird: Use-after-free in FontFaceSet firefox: thunderbird: The WebCompat WebExtension shipped with Firefox exposed a persistent UUID firefox: thunderbird: Incorrect parsing of URLs could have allowed embedding of youtube.com firefox: thunderbird: Content-Disposition header ignored when a file is included in an embed or object tag

SUSE-SU-2025:02123-1 — Security update for MozillaFirefox

Security update for MozillaFirefox

UBUNTU-CVE-2025-6430

Affected: Ubuntu:18.04:LTS: mozjs52, Ubuntu:18.04:LTS: mozjs38, Ubuntu:20.04:LTS: mozjs68, Ubuntu:20.04:LTS: mozjs52, Ubuntu:22.04:LTS: mozjs102, Ubuntu:22.04:LTS: mozjs78, Ubuntu:22.04:LTS: mozjs91, Ubuntu:22.04:LTS: thunderbird, Ubuntu:24.04:LTS: mozjs102, Ubuntu:24.04:LTS: mozjs115

WID-SEC-W-2025-1395 — Mozilla Firefox: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Mozilla Firefox ESR ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Angriff auszulösen, Sicherheitsmaßnahmen zu umgehen oder einen Cross-Site-Scripting-Angriff zu starten.