Input validation error in Mozilla products - CVE-2025-1936

Vulnerability identifier: #VU105318

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2025-1936

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Affected software:
Firefox for Android
Firefox ESR
Mozilla Firefox
Gentoo Linux
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP3
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Workstation Extension 15
Anolis OS
SUSE Enterprise Storage
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Slackware Linux
SUSE Package Hub 15
Desktop Applications Module
openSUSE Leap
Ubuntu
openEuler
Fedora
Oracle Solaris
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
www-client/firefox-bin
www-client/firefox
dev-lang/spidermonkey
mozilla-firefox
mozilla-thunderbird
thunderbird (Debian package)
firefox-esr (Debian package)
firefox
firefox-debugsource
firefox-debuginfo
firefox (Red Hat package)
MozillaFirefox-debuginfo
MozillaFirefox-devel
MozillaFirefox-debugsource
MozillaFirefox
MozillaFirefox-translations-common
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird-debuginfo
MozillaThunderbird
MozillaFirefox-translations-other
MozillaFirefox-branding-upstream
mail-client/thunderbird
mail-client/thunderbird-bin
thunderbird
thunderbird-debuginfo
thunderbird-debugsource
thunderbird-librnp-rnp
thunderbird-wayland
thunderbird (Ubuntu package)
firefox (Ubuntu package)
Mozilla Thunderbird

The vulnerability allows a remote attacker to bypass security restrictions.

The vulnerability exists due to insufficient validation of a null-byte character (e.g. %00) in the filename when retrieving local file content packaged in a ZIP archive via jar: URLs. The null and everything after it is ignored when retrieving the content from the archive, but the fake extension after the null is used to determine the type of content. A remote attacker can hide code in a web extension disguised as a safe file, such as an image.

Install updates from vendor's website.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1940027
• https://www.mozilla.org/security/advisories/mfsa2025-14/
• https://www.mozilla.org/security/advisories/mfsa2025-16/