PT-2026-49667 · Mozilla+1 · Firefox+2

Haruka Yamazaki · CVE-2026-12298 · Published 2026-06-16 · Updated 2026-07-10

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:H/PR:N/UI:R/S:U/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 memory safety bug exists that could lead to instability or unauthorized actions by improperly handling memory operations.

Recommendations Update to version 152 Update to version 140.12 Update to version 152 Update to version 140.12

Fix

DoS

Type Confusion

Memory Corruption

Out of bounds Read

Use After Free

Weakness Enumeration

CWE-843

CWE-787

CWE-125

CWE-416

Related Identifiers

ALSA-2026:27717

ALSA-2026:27733

ALSA-2026:27734

ALSA-2026:29940

ALSA-2026:30846

ALSA-2026:33445

CVE-2026-12298

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 · 247

• https://osv.dev/vulnerability/SUSE-SU-2026:22351-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-12298 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-57/#CVE-2026-12298 · 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
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-12298 · Security Note
• 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