PT-2026-40022 · Mozilla · Firefox

Bill Demirkapi · Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-8390

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150.0.3

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 to version 150.0.3.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-8390

Affected Products

Firefox

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-8390 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-8390 · Security Note
• https://ubuntu.com/security/CVE-2026-8390 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-45/#CVE-2026-8390 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8390 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-45 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2038081 · Note
• https://t.me/CVEtracker/53518 · Telegram Post