NVD Vulnerability Detail
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CVE-2026-4721
Summary

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.

Summary

Errores de seguridad de memoria presentes en Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 y Thunderbird 148. Algunos de estos errores mostraron evidencia de corrupción de memoria y presumimos que, con suficiente esfuerzo, algunos de estos podrían haber sido explotados para ejecutar código arbitrario. Esta vulnerabilidad afecta a Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149 y Thunderbird < 140.9.

Publication Date March 24, 2026, 10:16 p.m.
Registration Date April 15, 2026, 11:21 a.m.
Last Update April 14, 2026, 12:17 a.m.
CVSS3.1 : CRITICAL
スコア 9.8
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
攻撃元区分(AV) ネットワーク
攻撃条件の複雑さ(AC)
攻撃に必要な特権レベル(PR) 不要
利用者の関与(UI) 不要
影響の想定範囲(S) 変更なし
機密性への影響(C)
完全性への影響(I)
可用性への影響(A)
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* 115.34.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* 149.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* 128.0 140.9.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* 140.9.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* 149.0
Related information, measures and tools
Common Vulnerabilities List