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firefox: thunderbird: Use-after-free in the JavaScript Engine component

🗓️ 21 Jan 2026 12:03:00Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 3 Views

Use-after-free in the JavaScript Engine affects Firefox before 147, Firefox extended support before 140.7, Thunderbird before 147, and Thunderbird before 140.7.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.7aarch64thunderbird0:140.7.0-1.el9_7thunderbird-0:140.7.0-1.el9_7.aarch64.rpm
Red Hat Enterprise Linux9.7ppc64lethunderbird0:140.7.0-1.el9_7thunderbird-0:140.7.0-1.el9_7.ppc64le.rpm
Red Hat Enterprise Linux9.7s390xthunderbird0:140.7.0-1.el9_7thunderbird-0:140.7.0-1.el9_7.s390x.rpm
Red Hat Enterprise Linux9.7x86_64thunderbird0:140.7.0-1.el9_7thunderbird-0:140.7.0-1.el9_7.x86_64.rpm
Red Hat Enterprise Linux9.7aarch64thunderbird-debuginfo0:140.7.0-1.el9_7thunderbird-debuginfo-0:140.7.0-1.el9_7.aarch64.rpm
Red Hat Enterprise Linux9.7ppc64lethunderbird-debuginfo0:140.7.0-1.el9_7thunderbird-debuginfo-0:140.7.0-1.el9_7.ppc64le.rpm
Red Hat Enterprise Linux9.7s390xthunderbird-debuginfo0:140.7.0-1.el9_7thunderbird-debuginfo-0:140.7.0-1.el9_7.s390x.rpm
Red Hat Enterprise Linux9.7x86_64thunderbird-debuginfo0:140.7.0-1.el9_7thunderbird-debuginfo-0:140.7.0-1.el9_7.x86_64.rpm
Red Hat Enterprise Linux9.7aarch64thunderbird-debugsource0:140.7.0-1.el9_7thunderbird-debugsource-0:140.7.0-1.el9_7.aarch64.rpm
Red Hat Enterprise Linux9.7ppc64lethunderbird-debugsource0:140.7.0-1.el9_7thunderbird-debugsource-0:140.7.0-1.el9_7.ppc64le.rpm
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30 Jun 2026 14:14Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.19.8
EPSS0.00423
SSVC
3