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Mozilla Firefox CVE-2026-84126

| EUVDEUVD-2026-69075 MEDIUM
Classic Buffer Overflow (CWE-120)
2026-09-01 mozilla GHSA-3jcw-33fg-2hgv
Buffer Overflow Mozilla
4.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Web-delivered content requires victim navigation (UI:R, PR:N); boundary overflow yields only partial memory read (C:L), with no write primitive or availability impact confirmed.

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
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
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Sep 01, 2026 - 15:54 vuln.today
CVSS changed
Sep 01, 2026 - 15:22 NVD
4.3 (MEDIUM)
CVE Published
Sep 01, 2026 - 12:18 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 01, 2026 - 12:18 cve.org
MEDIUM 4.3

DescriptionCVE.org

Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155.

AnalysisAI

Incorrect boundary conditions in Firefox's CSS Grid layout engine expose limited browser process memory to remote attackers who deliver crafted web content. All Firefox versions prior to 155 are affected; exploitation requires a victim to visit or render attacker-controlled content, producing low-level confidentiality disclosure with no integrity or availability impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a victim to actively navigate to or load attacker-controlled web content in Firefox prior to version 155 - for example by following a link, opening an email with embedded HTML, or loading a malicious advertisement. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment At CVSS 4.3 Medium, this vulnerability carries a modest real-world risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: Firefox 155. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-120 – Classic Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-84126 vulnerability details – vuln.today
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