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Mozilla Firefox CVE-2026-74946

| EUVDEUVD-2026-60753 HIGH
Buffer Overflow (CWE-119)
2026-08-18 mozilla GHSA-9x2q-3qm9-cw76
Privilege Escalation Buffer Overflow Red Hat Mozilla Suse
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
8.8 HIGH

Network-delivered via crafted page, no privileges needed, user must visit page (UI:R); full memory corruption impact justifies C:H/I:H/A:H.

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
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Aug 18, 2026 - 16:55 vuln.today
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 8.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

Articles & Coverage 1

News 12 New Mozilla Vulnerabilities - 12 High Severity, No POC Available Aug 18, 2026

AnalysisAI

Privilege escalation via incorrect boundary conditions in Firefox's Graphics: CanvasWebGL component allows remote attackers to achieve high-impact code execution by luring users to a crafted web page. The flaw affects all Firefox releases prior to version 154 and multiple ESR branches (115.x, 140.x, 153.x), making the exposure broad across both consumer and enterprise deployments. No active exploitation has been confirmed (SSVC: Exploitation: none), but the CVSS 8.8 score and total technical impact classification warrant prompt patching.

Technical ContextAI

The vulnerability resides in Firefox's WebGL canvas rendering pipeline (Graphics: CanvasWebGL), which exposes the OpenGL ES 2.0/3.0 API to JavaScript for hardware-accelerated 2D and 3D graphics. CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) indicates the root cause is a missing or incorrectly implemented bounds check - a class of flaw that in browser graphics stacks typically manifests as a heap or stack buffer overflow when processing attacker-controlled shader or texture data. The CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* covers all Firefox product variants across all platforms, and the multiple ESR advisory references (mfsa2026-74 through mfsa2026-77) confirm the flaw spans several maintained release lines simultaneously. WebGL is enabled by default in all modern Firefox builds, so no special configuration is required to reach the vulnerable code path.

RemediationAI

The primary fix is to upgrade to Firefox 154 or to the appropriate patched ESR release: Firefox ESR 115.39, Firefox ESR 140.14, or Firefox ESR 153.1, as documented in Mozilla security advisories mfsa2026-74 through mfsa2026-77 at https://www.mozilla.org/security/advisories/ and the associated Bugzilla report at https://bugzilla.mozilla.org/show_bug.cgi?id=2059997. Organizations managing ESR deployments should apply the patch corresponding to their deployed branch rather than upgrading to the latest release channel if that conflicts with change-management policy. If immediate patching is not feasible, a compensating control is to disable WebGL via the Firefox policy engine (setting webgl.disabled=true in about:config or via enterprise policy), which removes access to the vulnerable code path at the cost of breaking WebGL-dependent web applications. Disabling JavaScript entirely would also prevent exploitation but is operationally impractical for most environments.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2020-0796 CRITICAL POC
10.0
CVE-2017-11882 HIGH POC
7.8
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CVE-2015-2426 HIGH POC
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CVE-2013-3918 HIGH POC
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CVE-2023-4966 HIGH POC
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CVE-2013-3660 HIGH POC
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Same technique Privilege Escalation

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CVE-2024-9474 MEDIUM POC
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CVE-2017-5689 CRITICAL POC
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CVE-2021-20021 CRITICAL POC
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CVE-2017-12635 CRITICAL POC
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Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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CVE-2026-74946 vulnerability details – vuln.today
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