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Mozilla Firefox EUVDEUVD-2026-46221

| CVE-2026-16384 HIGH
Use of Uninitialized Resource (CWE-908)
2026-07-21 mozilla GHSA-mmg7-4c9c-2r54
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

Network-delivered via web content, but realistically requires the victim to visit a malicious page, so UI:R; discloses memory (C:H) with no integrity or availability impact.

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 remote attackers to read uninitialized memory contents via crafted WebGPU operations, potentially leaking sensitive process memory such as heap data, addresses, or other page content. The flaw is network-reachable without authentication or user interaction beyond visiting a malicious page, but carries no integrity or availability impact. There is no public exploit identified at time of analysis, and EPSS estimates a low 0.14% exploitation probability.

Technical ContextAI

WebGPU is the modern browser API exposing GPU compute and rendering capabilities to JavaScript, succeeding WebGL and giving web content lower-level access to graphics hardware. The root cause is classified as CWE-908 (Use of Uninitialized Resource): a memory buffer or resource within the WebGPU implementation is read before it is initialized, so its contents reflect whatever residual data previously occupied that memory region. Because WebGPU handles textures, buffers, and shader outputs that can be read back into JavaScript, an uninitialized allocation can expose bytes left over from prior allocations in the browser's process address space. The affected CPE is cpe:2.3:a:mozilla:firefox, and Mozilla addressed the issue in the Firefox 153 release.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which is the primary and complete fix. Refer to Mozilla advisory MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/) and bug 2041911 (https://bugzilla.mozilla.org/show_bug.cgi?id=2041911). Where immediate updating is not possible, a targeted compensating control is to disable WebGPU by setting the dom.webgpu.enabled preference to false in about:config, which removes the vulnerable attack surface at the cost of breaking sites that rely on WebGPU-accelerated graphics or compute; because WebGPU adoption is still limited, this workaround has relatively low functional impact for most users. Enterprise fleets can enforce this via policy alongside standard browser auto-update enforcement.

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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-2026-46221 vulnerability details – vuln.today
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