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Mozilla Firefox CVE-2026-12293

| EUVDEUVD-2026-37084 CRITICAL
Use After Free (CWE-416)
2026-06-16 mozilla GHSA-x9gx-8m8x-g5mg
Information Disclosure Use After Free Memory Corruption Mozilla
9.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Remote via malicious web content with low complexity and no privileges, but a browser content-process UAF requires the victim to load the page, so UI:R rather than UI:N; memory corruption yields high C/I/A.

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:46 vuln.today
CVE Published
Jun 16, 2026 - 11:52 nvd
CRITICAL 9.8
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

Use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 152.

AnalysisAI

Memory corruption in Mozilla Firefox's Graphics: WebGPU component (fixed in Firefox 152) allows an attacker who lures a victim to a malicious page to trigger a use-after-free (CWE-416), potentially leading to information disclosure or arbitrary code execution in the content process. There is no public exploit identified at time of analysis and the flaw is not in CISA KEV, though CISA's SSVC framework rates its technical impact as total and marks it automatable. EPSS is low at 0.15% (5th percentile), consistent with no observed in-the-wild exploitation.

Technical ContextAI

The bug lives in Firefox's WebGPU implementation, the browser API that exposes GPU compute and rendering to untrusted web content via JavaScript/WGSL. WebGPU manages a complex web of GPU resource objects (buffers, textures, bind groups, command encoders) whose lifetimes are reference-counted across the JS heap and the native graphics backend. A use-after-free (CWE-416) occurs when such an object is freed but a dangling reference is subsequently dereferenced, letting an attacker reallocate the freed slot with controlled data and corrupt memory. Because WebGPU is reachable directly from web script and drives low-level graphics state, this class of bug is a high-value browser exploitation primitive. The affected product per CPE is cpe:2.3:a:mozilla:firefox (all versions prior to the 152 fix).

RemediationAI

Vendor-released patch: upgrade to Firefox 152 or later, which contains the fix per Mozilla advisories MFSA2026-57 and MFSA2026-60 (https://www.mozilla.org/security/advisories/mfsa2026-57/, https://www.mozilla.org/security/advisories/mfsa2026-60/); Linux distribution users should apply the corresponding vendor package, e.g. via the Red Hat advisory (https://access.redhat.com/security/cve/CVE-2026-12293). Where immediate patching is not possible, the specific compensating control is to disable WebGPU by setting dom.webgpu.enabled to false in about:config, which removes the vulnerable attack surface at the cost of breaking sites that rely on GPU-accelerated compute/rendering; enterprise fleets can enforce this via policies.json. Prioritize patching on systems where users browse untrusted web content.

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Same weakness CWE-416 – Use After Free

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
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

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CVE-2026-12293 vulnerability details – vuln.today
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