PT-2026-49665 · Mozilla+1 · Firefox+2

Yaqoub Aldurayhim · CVE-2026-12296 · Published 2026-06-16 · Updated 2026-07-10

Positive Technologies (AI Summary)

CVSS v3.1

9.6

Critical

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Firefox ESR versions prior to 140.12 Thunderbird versions prior to 152 Thunderbird versions prior to 140.12

Description A sandbox escape exists within the Security: Process Sandboxing component. A sandbox is a security mechanism for separating running programs, usually in an effort to mitigate the impact of a vulnerability by restricting the program's access to the rest of the system.

Recommendations Update Firefox to version 152. Update Firefox ESR to version 140.12. Update Thunderbird to version 152. Update Thunderbird to version 140.12.

Fix

DoS

Protection Mechanism Failure

Weakness Enumeration

CWE-403

CWE-693

Related Identifiers

ALSA-2026:27717

ALSA-2026:27733

ALSA-2026:27734

ALSA-2026:29940

ALSA-2026:30846

ALSA-2026:33445

CVE-2026-12296

OESA-2026-2735

OPENSUSE-SU-2026:11052-1

OPENSUSE-SU-2026:11055-1

OPENSUSE-SU-2026:11072-1

OPENSUSE-SU-2026:21043-1

OPENSUSE-SU-2026:21168-1

RHSA-2026:33445

SUSE-SU-2026:22351-1

SUSE-SU-2026:2582-1

SUSE-SU-2026:2583-1

SUSE-SU-2026:2814-1

SUSE-SU-2026:2852-1

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 245

• https://osv.dev/vulnerability/SUSE-SU-2026:22351-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12315 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-12325 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-58 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:11055-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:27733 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:11052-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:27717 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:39428 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12289 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:21168-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:39142 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12329 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-12290 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-12302 · Security Note