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Mozilla Firefox CVE-2026-74989

| EUVDEUVD-2026-60700 CRITICAL
Buffer Overflow (CWE-119)
2026-08-18 mozilla GHSA-c9qh-jjjj-xhq4
Buffer Overflow Mozilla
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) 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

Network-delivered browser content bug with no privileges needed, but the victim must load malicious content so UI:R; memory corruption plausibly yields full C/I/A impact.

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
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: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

4
Analysis Generated
Aug 20, 2026 - 18:32 vuln.today
CVSS changed
Aug 20, 2026 - 18:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 18, 2026 - 12:23 cve.org
CRITICAL 9.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Internally found bugs present in Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154.

AnalysisAI

Memory-safety defects in Mozilla Firefox 153 could allow remote attackers to corrupt memory and potentially achieve arbitrary code execution when a victim renders malicious web content, and were resolved in Firefox 154. These bugs were discovered internally by Mozilla with no public exploit identified at time of analysis, and the EPSS exploitation probability is low (0.15%, 5th percentile). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Host malicious web content
Delivery
Victim loads page in Firefox 153
Exploit
Trigger memory corruption in renderer
Execution
Corrupt process memory
Impact
Attempt code execution in browser
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to run Firefox 153 and to render attacker-controlled web content (visit a malicious page or view attacker-injected content), which is the practical trigger for these Gecko memory-corruption bugs despite the published UI:N metric. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict and warrant interpretation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious web page (or injects malicious content into a compromised/ad-served page) crafted to trigger one of the memory-corruption defects in Firefox 153's rendering engine. A victim running the vulnerable version visits the page, the corrupted memory operation is triggered during content parsing, and the attacker attempts to leverage it toward code execution in the browser process. …
Remediation Vendor-released patch: upgrade to Mozilla Firefox 154, which contains the fixes for all bundled memory-safety bugs. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours, conduct an inventory of Firefox 153 installations across the organization. …

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

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Same weakness CWE-119 – Buffer Overflow

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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-2026-74989 vulnerability details – vuln.today
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