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Mozilla CVE-2026-5733

| EUVDEUVD-2026-19612 HIGH
Buffer Overflow (CWE-119)
2026-04-07 mozilla
Mozilla Buffer Overflow
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

6
Analysis Updated
Apr 16, 2026 - 06:05 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
149.0.2
EUVD ID Assigned
Apr 07, 2026 - 13:00 euvd
EUVD-2026-19612
Analysis Generated
Apr 07, 2026 - 13:00 vuln.today
CVE Published
Apr 07, 2026 - 12:43 nvd
HIGH 8.8

DescriptionCVE.org

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability affects Firefox < 149.0.2.

AnalysisAI

Buffer overflow in Firefox WebGPU implementation allows remote code execution when users interact with malicious web content. Affects all Firefox versions prior to 149.0.2. Network-based attack requires user interaction (visiting crafted webpage) but no authentication. CVSS 8.8 reflects high confidentiality, integrity, and availability impact. No public exploit identified at time of analysis, though Mozilla's rapid patch release suggests significant risk potential.

Technical ContextAI

The vulnerability resides in Firefox's WebGPU component, which implements the W3C WebGPU API for hardware-accelerated graphics and compute operations in web browsers. The issue stems from incorrect boundary condition handling (CWE-119), a class of memory safety vulnerabilities that can lead to buffer overflows. WebGPU operates as a modern replacement for WebGL, providing low-level GPU access to JavaScript code. Incorrect boundary validation in this context typically means the browser fails to properly validate memory buffer sizes, offsets, or indices when processing WebGPU commands from web content. This affects the Mozilla Firefox CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, specifically all versions before the 149.0.2 security release. The vulnerability is tracked internally as Mozilla bug 2022554.

RemediationAI

Immediately upgrade to Firefox version 149.0.2 or later, which contains the vendor-released patch addressing the boundary condition vulnerability. Mozilla has published the fix in their security advisory MFSA2026-25 available at https://www.mozilla.org/security/advisories/mfsa2026-25/. Users should verify their Firefox version by navigating to Settings > About Firefox, which will automatically check for and apply updates. Enterprise deployments using managed Firefox installations should push version 149.0.2 through their software distribution systems. For environments where immediate patching is not feasible, consider disabling WebGPU functionality as a temporary mitigation, though this may break functionality on graphics-intensive web applications. Technical details are documented in Mozilla's bug tracker at https://bugzilla.mozilla.org/show_bug.cgi?id=2022554, though access may be restricted until broader patch adoption occurs. No workarounds provide equivalent protection to patching; upgrade to 149.0.2 remains the only complete remediation.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: High
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-2026-5733 vulnerability details – vuln.today
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