Use-after-free in Mozilla products - CVE-2026-92021

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Main Vulnerability Database Vulnerabilities #VU150056

Use-after-free in Mozilla products - CVE-2026-92021

Published: September 15, 2026


Vulnerability identifier: #VU150056
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-92021
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in the JavaScript Engine: JIT component when processing web content. A remote attacker can trigger the use-after-free condition to execute arbitrary code.


Affected software

Firefox ESR
Mozilla Firefox
Firefox for Android
Debian Linux
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
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
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox
firefox-debugsource
firefox-debuginfo
firefox (Red Hat package)
firefox-esr (Debian package)

How to mitigate CVE-2026-92021

Install security update from vendor's website.

Firefox ESR - addressed in versions 140.16.0, 153.3.0
Firefox for Android - update to 156.0
Mozilla Firefox - update to 156.0
firefox - addressed in versions 140.16.0-1, 140.17.0-1.0.1
firefox-debugsource - update to 140.16.0-1
firefox - update to 140.16.0-1
firefox-debuginfo - update to 140.16.0-1
firefox (Red Hat package) - addressed in versions 140.16.0-1.el7_9, 140.16.0-1.el8_4, 140.16.0-1.el8_6, 140.16.0-1.el8_8, 140.16.0-1.el8_10, 140.16.0-1.el9_2, 140.16.0-1.el9_4, 140.16.0-1.el9_6, 140.16.0-1.el10_0, 140.16.0-1.el10_2
firefox-esr (Debian package) - update to 140.16.0esr-1~deb13u1

External References

Related Security Bulletins