PT-2026-33944 · Mozilla · Firefox+1

Published 2026-04-21 · Updated 2026-04-27 · CVE-2026-6758

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150 Thunderbird versions prior to 150

Description A use-after-free issue exists in the JavaScript: WebAssembly component. Use-after-free is a memory corruption flaw that occurs when an application continues to use a pointer after it has been freed.

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

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-6758

OPENSUSE-SU-2026:10626-1

Affected Products

Firefox

Thunderbird

References · 55

• https://mozilla.org/en-US/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-30 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-6758 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6758 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10626-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6758 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6758 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-6758 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6758 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-6763 · Note
• https://suse.com/security/cve/CVE-2026-6771 · Note
• https://suse.com/security/cve/CVE-2026-6770 · Note
• https://suse.com/security/cve/CVE-2026-6756 · Note