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Mozilla Firefox CVE-2026-16386

| EUVDEUVD-2026-46223 HIGH
Use of Uninitialized Resource (CWE-908)
2026-07-21 mozilla GHSA-cg63-h6r4-gp45
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-reachable via a web page but requires the victim to load attacker WebGPU content (UI:R); confidentiality-only leak of memory (C:H, I:N, A:N), no scope change.

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 - 19:01 vuln.today
CVSS changed
Jul 22, 2026 - 18:22 NVD
7.5 (HIGH)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 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 malicious web page to read uninitialized process memory, potentially leaking sensitive data such as heap contents, pointers, or cross-origin material, before the fix in Firefox 153. The flaw stems from WebGPU operating on memory that was never initialized (CWE-908), and while CVSS rates confidentiality impact High (7.5), EPSS is very low (0.14%, 4th percentile) with no public exploit and no CISA KEV listing. Exploitation is browser-based, requiring a victim to load attacker-controlled WebGPU content.

Technical ContextAI

WebGPU is the modern successor to WebGL, giving web content low-level access to the GPU for rendering and general-purpose compute via shaders and buffer/texture allocations. This vulnerability is a CWE-908 (Use of Uninitialized Resource) condition: a WebGPU allocation (buffer, texture, or intermediate resource) is read or returned to the page before being zero-filled or otherwise initialized, so residual bytes from prior allocations or unrelated process memory bleed into web-accessible results. Because WebGPU compute and readback paths let JavaScript retrieve buffer/texture contents, uninitialized data becomes directly observable to the attacker's script. The affected product per CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, i.e. the Firefox browser across versions prior to 153.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which is the primary and complete remediation. Consult MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/) for the authoritative fixed-version guidance and the Bugzilla entry (https://bugzilla.mozilla.org/show_bug.cgi?id=2041916) for technical detail. If immediate patching is not possible, a targeted compensating control is to disable WebGPU by setting dom.webgpu.enabled to false in about:config (or via enterprise policy), which removes the vulnerable code path entirely; the trade-off is that WebGPU-dependent sites lose GPU acceleration for compute/rendering, though impact is limited today because WebGPU adoption is still narrow. Enterprise fleets should push the update through their existing Firefox ESR/policy management channel rather than relying on individual users.

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Same weakness CWE-908 – Use of Uninitialized Resource

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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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CVE-2026-16386 vulnerability details – vuln.today
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