Description
Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9Attack Vector: Network
Complexity: Low
Privileges: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High
Affected Packages7 packages
🔴Vulnerability Details
3GHSAGHSA-qmr7-46p8-4c5r: Use-after-free in the JavaScript Engine component↗2026-02-24 CVEListUse-after-free in the JavaScript Engine component↗2026-02-24 OSVCVE-2026-2763: Use-after-free in the JavaScript Engine component↗2026-02-24 📋Vendor Advisories
7Red Hatfirefox: thunderbird: Use-after-free in the JavaScript Engine component↗2026-02-24 DebianCVE-2026-2763: firefox - Use-after-free in the JavaScript Engine component. This vulnerability affects Fi...↗2026 MozillaMozilla Foundation Security Advisory 2026-15: CVE-2026-2763↗ MozillaMozilla Foundation Security Advisory 2026-16: CVE-2026-2763↗ MozillaMozilla Foundation Security Advisory 2026-14: CVE-2026-2763↗ 🕵️Threat Intelligence
1WizCVE-2026-2763 Impact, Exploitability, and Mitigation Steps | Wiz↗ 💬Community
1BugzillaCVE-2026-2763 firefox: thunderbird: Use-after-free in the JavaScript Engine component↗2026-02-24