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Mozilla Firefox EUVDEUVD-2026-60751

| CVE-2026-74944 CRITICAL
Use After Free (CWE-416)
2026-08-18 mozilla GHSA-77j9-v7c9-544q
Use After Free Information Disclosure Mozilla Memory Corruption Red Hat 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
7.5 HIGH

Remote via web content but requires the victim to load a malicious page (UI:R) and reliable use-after-free exploitation needs heap grooming (AC:H); no privileges needed (PR:N), with high content-process impact.

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 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

4
Analysis Generated
Aug 20, 2026 - 23:07 vuln.today
CVSS changed
Aug 20, 2026 - 20:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 18, 2026 - 12:23 nvd
CRITICAL 9.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Memory corruption via a use-after-free in Firefox's DOM: Core & HTML component allows a remote attacker to trigger dangling-pointer reuse in the browser engine, potentially leading to arbitrary code execution within the content process. All Firefox and Firefox ESR users on versions prior to Firefox 154, ESR 140.14, and ESR 153.1 are affected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious page
Delivery
Serve crafted HTML/JS
Exploit
Trigger DOM use-after-free
Execution
Reclaim freed object with controlled data
Persist
Corrupt memory in content process
Impact
Execute attacker code
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to load attacker-controlled web content in an unpatched Firefox (before 154 / ESR 140.14 / ESR 153.1) - i.e., visiting a malicious site or rendering attacker-supplied HTML in an ad, iframe, or embedded view. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are mixed and worth weighing carefully. … 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 or ad-served frame) containing crafted HTML and JavaScript that manipulates DOM objects to free memory while a dangling reference remains, then reclaims the freed allocation with controlled data. When the victim's unpatched Firefox visits the page, the engine dereferences the stale pointer, giving the attacker memory corruption in the content process that can be developed into code execution. …
Remediation Vendor-released patch: upgrade to Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1 (or later) 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: Issue urgent advisory to all Firefox users recommending immediate browser update or temporary use of alternative browsers; disable Firefox if operationally feasible. …

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

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Same weakness CWE-416 – Use After Free

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Same technique Use After Free

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8
CVE-2012-4969 HIGH POC
8.1

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-2026-60751 vulnerability details – vuln.today
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