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Mozilla Firefox EUVDEUVD-2026-46222

| CVE-2026-16385 HIGH
Use of Uninitialized Resource (CWE-908)
2026-07-21 mozilla GHSA-xmq2-crj6-vr9m
Information Disclosure Red Hat Mozilla
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

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

Remote content triggers the flaw but the victim must load a malicious WebGPU page, so UI:R; impact is confidentiality-only from leaked uninitialized memory, hence C:H, I:N, A:N.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/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
None

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 19:00 vuln.today
CVSS changed
Jul 22, 2026 - 18:22 NVD
7.5 (HIGH)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
HIGH 7.5

DescriptionCVE.org

Information disclosure due to uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Information disclosure in Mozilla Firefox's Graphics WebGPU component allows a remote attacker to read leftover uninitialized memory, potentially exposing sensitive data such as other pages' content, GPU buffers, or process memory. The flaw stems from a WebGPU code path returning memory that was never zeroed, and is fixed in Firefox 153; there is no public exploit identified at time of analysis and the EPSS score is low (0.14%, 4th percentile).

Technical ContextAI

The vulnerability lives in Firefox's WebGPU implementation, the browser API that gives web content direct access to the GPU for compute and rendering. The root cause is CWE-908 (Use of Uninitialized Resource): a buffer, texture, or memory region exposed through the WebGPU pipeline is handed to script or read back without first being initialized/zeroed, so residual bytes from prior allocations leak into content-visible results. Because WebGPU operates close to native graphics drivers and shared GPU memory, uninitialized reads can surface fragments of unrelated data. The affected component is Firefox itself (cpe:2.3:a:mozilla:firefox), and the fix landed in Firefox 153 per Mozilla advisory MFSA2026-68.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, per Mozilla advisory MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/). Most installations will receive this through Firefox's automatic update channel; enterprises using ESR or managed deployments should push the corresponding fixed build. As an interim compensating control before patching, WebGPU can be disabled by setting dom.webgpu.enabled to false in about:config (or via enterprise policy), which removes the vulnerable attack surface at the cost of breaking sites that rely on GPU-accelerated compute/graphics via WebGPU. Details of the underlying defect are in https://bugzilla.mozilla.org/show_bug.cgi?id=2041912.

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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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EUVD-2026-46222 vulnerability details – vuln.today
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