CVEvulnerability

CVE-2026-4721

9.8 CRITICAL Published 2026-03-24 Modified 2026-07-15 Official page ↗
Status
Modified
Published
2026-03-24
Last modified
2026-07-15
Assigner
[email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.5 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-120, CWE-825

Description

Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected configurations

• mozilla firefox (< 115.34.0) • mozilla firefox (< 149.0) • mozilla firefox (>= 128.0 < 140.9.0) • mozilla thunderbird (< 140.9.0) • mozilla thunderbird (< 149.0)

Related

Weakness · CWE (2)

  • CWE-120 Buffer Copy without Checking Size of Input weakness
  • CWE-825 Expired Pointer Dereference weakness

References