CVE-2026-2786 - Vulnerability Analysis

Overview

Firefox < 148 and Firefox ESR < 140.8 contain a use-after-free vulnerability in the JavaScript Engine component, letting attackers cause memory corruption or remote code execution, exploit requires crafted JavaScript execution.

Severity & Score

Impact

Attackers can cause memory corruption or execute arbitrary code remotely via crafted JavaScript.

Mitigation

Update to Firefox 148, Firefox ESR 140.8 or later.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2013612
• https://www.mozilla.org/security/advisories/mfsa2026-13/
• https://www.mozilla.org/security/advisories/mfsa2026-15/
• https://www.mozilla.org/security/advisories/mfsa2026-16/
• https://www.mozilla.org/security/advisories/mfsa2026-17/

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Feb 26, 2026

🔴 CVE-2026-2786 - Critical (9.8) Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-2786/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

View original post

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner