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Mozilla Firefox EUVDEUVD-2026-40321

| CVE-2026-14241 CRITICAL
Out-of-bounds Write (CWE-787)
2026-06-30 mozilla GHSA-m5xh-h67j-5r2q
Memory Corruption Mozilla Buffer Overflow RCE Suse
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 web content (AV:N) but requires the victim to open a malicious page (UI:R); no auth (PR:N); memory corruption yields high C/I/A within the browser process (S:U).

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:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 01, 2026 - 16:00 vuln.today
CVSS changed
Jul 01, 2026 - 15:52 NVD
9.8 (CRITICAL)
CVE Published
Jun 30, 2026 - 13:32 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

Memory safety bugs present in Firefox 152.0.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152.0.4.

AnalysisAI

Memory-corruption weaknesses in Mozilla Firefox 152.0.3 could allow remote attackers to potentially execute arbitrary code within the browser process. Mozilla graded the collected memory-safety bugs as critical (MFSA2026-62) and states some showed evidence of memory corruption that, with sufficient effort, could be exploited for code execution; there is no public exploit identified at time of analysis and EPSS exploitation probability is low (0.14%, 4th percentile). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious page
Delivery
Serve crafted web content
Exploit
Trigger out-of-bounds write in Gecko
Execution
Corrupt browser process memory
Impact
Attempt arbitrary code execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to load attacker-controlled web content in Firefox 152.0.3 (visiting a malicious or compromised page / rendering crafted content), which triggers the out-of-bounds write. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and should be weighed carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts or compromises a web page containing content crafted to trigger one of the out-of-bounds write conditions in Firefox 152.0.3's rendering engine. A victim running the vulnerable version visits the page, the memory corruption is triggered, and in a successful case the attacker could leverage it toward arbitrary code execution in the browser process. …
Remediation Vendor-released patch: Firefox 152.0.4 - upgrade all Firefox installations to 152.0.4 or later, which is the primary and complete fix; consult Mozilla advisory MFSA2026-62 (https://www.mozilla.org/security/advisories/mfsa2026-62/) for details. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running Firefox 152.0.3 or earlier using your endpoint management platform. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Same weakness CWE-787 – Out-of-bounds Write

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CVE-2014-1761 HIGH POC
7.8
CVE-2009-3129 HIGH POC
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CVE-2021-1732 HIGH POC
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CVE-2013-3346 CRITICAL POC
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Same technique Memory Corruption

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2010-3333 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Not-Affected
SUSE Linux Enterprise Server 16.0 Not-Affected

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EUVD-2026-40321 vulnerability details – vuln.today
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