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Mozilla Firefox CVE-2026-12324

| EUVDEUVD-2026-37070 HIGH
Improper Check or Handling of Exceptional Conditions (CWE-703)
2026-06-16 mozilla GHSA-p449-4x9g-97vg
Mozilla Information Disclosure Red Hat Suse
High
Disputed · 7.3 Vendor: mozilla
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Severity by source

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

Browser flaw requires victim to load attacker page (UI:R); information-disclosure tag and Low impact metrics support C:L/A:L with no integrity impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
3.4 LOW
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:N/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 17:23 vuln.today
CVSS changed
Jun 16, 2026 - 17:22 NVD
7.3 (HIGH)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.

Articles & Coverage 1

News 5 New Mozilla Vulnerabilities - 5 High Severity, No Public POC Jun 16, 2026

AnalysisAI

Memory safety flaw in the CanvasWebGL graphics component of Mozilla Firefox allows remote attackers to trigger incorrect boundary handling through crafted web content, leading to limited confidentiality, integrity, and availability impact. The issue affects Firefox prior to version 152 and Firefox ESR prior to 140.12, and no public exploit identified at time of analysis. Reported by Mozilla with low complexity and no authentication required (CVSS 7.3).

Technical ContextAI

The vulnerability resides in Firefox's Graphics: CanvasWebGL component, which implements the WebGL JavaScript API for hardware-accelerated 2D and 3D rendering inside HTML <canvas> elements. CWE-703 (Improper Check or Handling of Exceptional Conditions) combined with the 'incorrect boundary conditions' language indicates a logic flaw where edge-case input values are not properly validated before being passed into the WebGL rendering pipeline, which sits atop native graphics libraries (OpenGL/ANGLE/Direct3D). Such boundary mishandling in browser graphics stacks typically arises when JavaScript-supplied buffer sizes, draw counts, or texture dimensions bypass sanity checks before reaching C++ rendering code. Affected CPE is cpe:2.3:a:mozilla:firefox covering all versions prior to the fixed releases.

RemediationAI

Vendor-released patch: upgrade to Firefox 152 or Firefox ESR 140.12 (or later) as documented in Mozilla advisories MFSA2026-57, MFSA2026-58, MFSA2026-60, and MFSA2026-61 at https://www.mozilla.org/security/advisories/. Enterprise deployments using ESR should validate the 140.12 build through standard update channels (managed deployment, WSUS-equivalent, or Mozilla's automatic update mechanism). As a compensating control where patching is delayed, administrators can disable WebGL by setting webgl.disabled=true in about:config or via enterprise policy, which prevents the vulnerable code path from being reached at the cost of breaking sites that rely on WebGL rendering (3D maps, games, data visualizations); restricting browsing to trusted internal sites via proxy filtering also reduces exposure but does not eliminate it.

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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 High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-12324 vulnerability details – vuln.today
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