CVE-2026-4729

| EUVD-2026-14873 CRITICAL
2026-03-24 mozilla GHSA-xh4v-qr89-3hj3
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14873
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.8

Tags

Mozilla RCE Buffer Overflow Firefox Thunderbird

Description

Memory safety bugs present in 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 affects Firefox < 149.

Analysis

Multiple memory safety bugs in Firefox 148 and Thunderbird 148 allow attackers to trigger memory corruption with potential for arbitrary code execution. Firefox versions prior to 149 are vulnerable, as confirmed by Mozilla security advisories. …

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Remediation

Within 24 hours: Identify all affected systems and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.

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Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +49
POC: 0

Vendor Status

Debian

firefox
Release Status Fixed Version Urgency
sid vulnerable 148.0.2-1 -
(unstable) fixed (unfixed) -

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CVE-2026-4729 vulnerability details – vuln.today
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