PT-2026-33971 · Mozilla+1 · Firefox+2

Andrew Mccreight + 2 · Published 2026-04-21 · Updated 2026-05-25 · CVE-2026-6785

Positive Technologies (AI Summary)

CVSS v2.0

7.6

High

Base vector

AV:N/AC:H/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Firefox ESR version 115.34 Firefox ESR version 140.9 Thunderbird ESR version 140.9 Firefox version 149 Thunderbird version 149

Description Memory safety bugs involving memory corruption could allow an attacker to run arbitrary code.

Recommendations Update Firefox ESR 115.34 to version 115.35. Update Firefox ESR 140.9 to version 140.10. Update Thunderbird ESR 140.9 to version 140.10. Update Firefox 149 to version 150. Update Thunderbird 149 to version 150.

Fix

DoS

Memory Corruption

Out of bounds Read

Use After Free

Weakness Enumeration

CWE-787

CWE-125

CWE-416

Related Identifiers

ALSA-2026:10757

ALSA-2026:10766

ALSA-2026:10767

ALSA-2026:12285

ALSA-2026:13537

ALSA-2026:15892

ALSA-2026:19348

BDU:2026-06953

CVE-2026-6785

OESA-2026-2105

OESA-2026-2106

OESA-2026-2107

OESA-2026-2108

OESA-2026-2109

OPENSUSE-SU-2026:10610-1

OPENSUSE-SU-2026:10626-1

RHSA-2026:10757

RHSA-2026:10766

RHSA-2026:10767

RHSA-2026:19348

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 197

• https://safe-surf.ru/specialists/bulletins-nkcki/732362 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6770 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6785 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6749 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-5734 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-32 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:10766 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2106 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:10757 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6769 · Security Note
• https://linux.oracle.com/errata/ELSA-2026-10757.html · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-34 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6785 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-6785 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6752 · Security Note