PT-2026-49699 · Mozilla+1 · Firefox Esr+2

CVE-2026-12330 · Published 2026-06-16 · Updated 2026-07-10

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox ESR versions prior to 140.12 Firefox ESR versions prior to 115.37 Thunderbird versions prior to 140.12

Description Incorrect boundary conditions exist within the Internationalization component.

Recommendations Update to version 140.12 for Firefox ESR. Update to version 115.37 for Firefox ESR. Update to version 140.12 for Thunderbird.

Fix

DoS

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

ALSA-2026:27717

ALSA-2026:27733

ALSA-2026:27734

ALSA-2026:29940

ALSA-2026:30846

ALSA-2026:33445

CVE-2026-12330

OESA-2026-2735

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 Esr

Rocky Linux

Thunderbird

References · 211

• 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://osv.dev/vulnerability/ALSA-2026:27717 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-58/#CVE-2026-12330 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12289 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-58/#CVE-2026-12330 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:21168-1 · 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://mozilla.org/en-US/security/advisories/mfsa2026-59 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-59 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12302 · Security Note