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Mozilla CVE-2026-4729

| EUVDEUVD-2026-14873 CRITICAL
Classic Buffer Overflow (CWE-120)
2026-03-24 mozilla GHSA-xh4v-qr89-3hj3
Mozilla RCE Buffer Overflow
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14873
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
CRITICAL 9.8

DescriptionCVE.org

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.

AnalysisAI

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. The vulnerability requires no user interaction beyond normal browsing and represents a critical elevation risk due to the presume-exploitable nature of the underlying memory corruption issues.

Technical ContextAI

These vulnerabilities represent classic memory safety issues in Mozilla's Gecko rendering engine and browser codebase, which are implemented in C/C++ and inherently susceptible to buffer overflows and use-after-free conditions. The affected products (Firefox and Thunderbird, identified via CPE cpe:2.3:a:mozilla:firefox) are large-scale, user-facing applications that parse untrusted web content and execute JavaScript. While specific CWE classifications are not provided in the intelligence, the tags indicate buffer overflow vulnerabilities, which typically fall under CWE-120 (Buffer Copy without Checking Size of Input) or related memory corruption classes. The Mozilla security advisory references (including bugzilla entries 1944033, 1997282, 2009213, 2011412, 2021925, 2022034) suggest multiple distinct memory safety defects across different components of the Gecko engine.

RemediationAI

Immediately upgrade Firefox to version 149 or later, and upgrade Thunderbird to a patched version (consult https://www.mozilla.org/security/advisories/mfsa2026-20/ for Thunderbird version specifics). For enterprise deployments, prioritize Firefox patching within 24-48 hours given the RCE potential. Organizations unable to patch immediately should consider temporarily disabling JavaScript execution for untrusted content via security policies, restricting browsing to trusted internal sites only, or deploying browser isolation solutions. Monitor Mozilla security advisories at https://www.mozilla.org/security/advisories/ for any indicators of active exploitation or related vulnerabilities.

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Same weakness CWE-120 – Classic Buffer Overflow

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Same technique RCE

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Vendor StatusVendor

Debian

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

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-4729 vulnerability details – vuln.today
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