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Mozilla Firefox CVE-2026-12303

| EUVDEUVD-2026-37094 MEDIUM
Out-of-bounds Read (CWE-125)
2026-06-16 mozilla GHSA-mx8m-2338-6rh3
Mozilla Information Disclosure Buffer Overflow Suse Red Hat
Medium
Disputed · 4.3 Vendor: mozilla
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Severity by source

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

Network-delivered via browser with no attacker privileges; mandatory user page visit (UI:R); read-only memory leak yields low confidentiality impact only, no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 15:51 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
4.3 (MEDIUM)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 152.

AnalysisAI

Out-of-bounds read in Firefox's WebGPU graphics component exposes browser memory contents to remote attackers who can lure a user to a malicious webpage. All Firefox versions prior to 152 are affected, with the vulnerability stemming from incorrect boundary conditions during GPU-accelerated rendering operations. No public exploit or active exploitation has been identified at time of analysis; exploitation requires user interaction, limiting opportunistic mass exploitation despite the zero-authentication requirement on the attacker side.

Technical ContextAI

The vulnerability resides in the WebGPU component (CWE-125: Out-of-bounds Read), a modern GPU compute and rendering API exposed to web content through Firefox's graphics stack. Incorrect boundary conditions mean the implementation reads beyond the intended limits of a GPU-side or CPU-side buffer, potentially exposing adjacent memory regions containing sensitive browser state. CPE data (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) confirms the wildcard version range, indicating all prior releases are affected until the fix shipped in Firefox 152. The 'Buffer Overflow' tag in the intelligence data is likely a secondary classification artifact - the primary root cause is the read-side boundary failure described by CWE-125, not a write overflow.

RemediationAI

Upgrade Mozilla Firefox to version 152 or later, which resolves this vulnerability per Mozilla Security Advisory mfsa2026-57 (https://www.mozilla.org/security/advisories/mfsa2026-57/). Organizations managing Firefox deployments via policy should prioritize this update in the next standard patch cycle given the medium severity and absence of active exploitation. If immediate patching is not feasible, a targeted workaround is to disable WebGPU via the about:config flag dom.webgpu.enabled = false - this eliminates the attack surface entirely but will degrade or break WebGPU-dependent web applications and is not suitable for environments relying on GPU-accelerated web content. No other vendor-confirmed compensating controls are documented in the available references.

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Same weakness CWE-125 – Out-of-bounds Read

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CVE-2014-0160 HIGH POC
7.5
CVE-2016-5198 HIGH POC
8.8
CVE-2016-1646 HIGH POC
8.8
CVE-2025-5777 HIGH POC
7.5
CVE-2017-5030 HIGH POC
8.8
CVE-2016-4523 HIGH
7.5
CVE-2024-48456 HIGH POC
7.5
CVE-2024-48457 HIGH POC
7.5

Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
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CVE-2025-24813 CRITICAL POC
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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

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-2026-12303 vulnerability details – vuln.today
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