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Mozilla Firefox EUVDEUVD-2026-60672

| CVE-2026-74987 CRITICAL
Buffer Overflow (CWE-119)
2026-08-18 mozilla GHSA-w34f-74jx-hvjc
Buffer Overflow Mozilla
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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
7.5 HIGH

Browser memory-corruption needs the victim to load malicious content (UI:R) and reliable exploitation of memory-safety bugs is non-trivial (AC:H); no auth (PR:N) and full code-execution impact (C/I/A:H).

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:A/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

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 19, 2026 - 13:34 vuln.today
CVSS changed
Aug 19, 2026 - 13:22 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 ESR 140.13, Firefox ESR 153.0 and 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, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Memory corruption in Mozilla Firefox 153, Firefox ESR 153.0, and Firefox ESR 140.13 allows remote attackers to potentially execute arbitrary code within the browser process when a victim renders attacker-controlled web content. Mozilla internally discovered a batch of memory-safety defects (tracked across advisories MFSA2026-74 through MFSA2026-80) and states that some showed evidence of memory corruption presumed exploitable with sufficient effort. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Host malicious web page
Delivery
Lure victim to load page
Exploit
Trigger memory corruption in Gecko engine
Execution
Corrupt heap/stack memory
Impact
Execute code in browser process
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to load attacker-controlled web content in an affected build (Firefox 153, ESR 153.0, or ESR 140.13) - the classic browser drive-by/social-engineering prerequisite. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, base 9.8) rates this as critical, but the UI:N component is questionable: browser memory-corruption bugs realistically require the victim to load malicious web content, i.e., user interaction - verify against Mozilla's own scoring. … 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 an ad or compromised site) crafted to trigger the memory-corruption defect in Firefox's rendering engine. When a user running an affected Firefox/ESR version visits the page, the corruption is triggered and, given sufficient exploit engineering, could lead to arbitrary code execution in the browser process. …
Remediation Vendor-released patch: upgrade to Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1 depending on your channel - this is the primary and complete fix. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems running affected Firefox versions (153, ESR 140.13, ESR 153.0) and prepare patch deployment packages for Firefox 154, ESR 140.14, and ESR 153.1 respectively; communicate the security update to all users. …

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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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EUVD-2026-60672 vulnerability details – vuln.today
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