PT-2026-33970 · Mozilla · Firefox+1

Published 2026-04-21 · Updated 2026-05-25 · CVE-2026-6784

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 version 149 Thunderbird version 149

Description Memory safety bugs involving memory corruption and out-of-bounds reads exist in the software. These issues could allow an unauthenticated remote attacker to execute arbitrary code on the system via a malicious website.

Recommendations Update Firefox to version 150. Update Thunderbird to version 150.

Fix

RCE

DoS

Use After Free

Memory Corruption

Out of bounds Read

Weakness Enumeration

CWE-416

CWE-787

CWE-125

Related Identifiers

BDU:2026-06957

CVE-2026-6784

OPENSUSE-SU-2026:10626-1

Affected Products

Firefox

Thunderbird

References · 59

• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-33 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-6784 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-6784 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6784 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6784 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6784 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-30 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6784 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10626-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06957 · Security Note
• https://suse.com/security/cve/CVE-2026-6746 · Note
• https://suse.com/security/cve/CVE-2026-6749 · Note
• https://suse.com/security/cve/CVE-2026-6754 · Note