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Mozilla Firefox CVE-2026-16393

| EUVDEUVD-2026-46230 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-727j-g2fh-46cv
Buffer Overflow Red Hat Mozilla
Critical
Disputed · 9.1 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
vuln.today AI
8.1 HIGH

Remote via malicious web content but a browser-content flaw realistically needs the user to load the page, so UI:R; memory-read plus crash gives C:H/A:H and I:N.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 19:05 vuln.today
CVSS changed
Jul 22, 2026 - 18:22 NVD
9.1 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 cve.org
CRITICAL 9.1

DescriptionCVE.org

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Memory corruption in Mozilla Firefox's WebGPU graphics component (fixed in Firefox 153) lets a remote attacker serving crafted web content trigger an out-of-bounds memory operation, enabling sensitive memory disclosure and browser crashes. The flaw is a CWE-119 boundary-condition error rated CVSS 9.1 (C:H/A:H, no integrity impact), consistent with an information-leak-plus-denial-of-service primitive rather than confirmed code execution. No public exploit identified at time of analysis, and EPSS is low (0.13%, 3rd percentile), indicating no evidence of active exploitation despite the high base score.

Technical ContextAI

The defect lives in Firefox's WebGPU implementation - the browser-exposed GPU compute/graphics API (successor to WebGL) reachable directly from untrusted JavaScript running on any visited page. WebGPU parses and validates buffer sizes, texture dimensions, and command-encoder parameters before handing work to the GPU driver; an incorrect boundary condition (CWE-119, Improper Restriction of Operations within the Bounds of a Memory Buffer) means a validation check computes or compares a size incorrectly, allowing reads or writes past an allocated buffer. Because WebGPU is script-reachable and processes attacker-controlled dimension/offset values, a malicious site can drive the vulnerable path without any special privileges. The single affected product per the CPE (cpe:2.3:a:mozilla:firefox) is Firefox itself.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which is the primary and complete fix. Confirm ESR/Thunderbird channels are on correspondingly patched builds. As an interim compensating control until updates roll out, disable WebGPU via about:config by setting dom.webgpu.enabled to false (and gfx.webgpu.force-enabled to false if present); this removes the attack surface entirely with the trade-off of breaking sites that rely on WebGPU-accelerated graphics or compute, which today is a small but growing set. Enterprise fleets can enforce this through Firefox policies. Reference the vendor advisory at https://www.mozilla.org/security/advisories/mfsa2026-68/ and bug 2045410 for authoritative fix details.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2023-4966 HIGH POC
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Same technique Buffer Overflow

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CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-16393 vulnerability details – vuln.today
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