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Mozilla Firefox EUVDEUVD-2026-60745

| CVE-2026-74936 CRITICAL
Use After Free (CWE-416)
2026-08-18 mozilla GHSA-m682-v78f-8q4j
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
8.8 HIGH

Network-delivered via web content with low complexity and no privileges, but triggering requires the victim to visit malicious content, so UI:R; full memory-safety impact yields C/I/A:H within the content 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:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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 - 23:09 vuln.today
CVSS changed
Aug 20, 2026 - 20:52 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 JavaScript: WebAssembly 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 JavaScript WebAssembly engine allows a remote attacker to corrupt heap memory and potentially achieve arbitrary code execution or information disclosure when a victim loads attacker-controlled content. All Firefox versions prior to Firefox 154, Firefox ESR 140.14, and Firefox 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 JS/WebAssembly module
Exploit
Trigger use-after-free in Wasm engine
Execution
Reclaim freed memory with controlled data
Impact
Execute code or leak memory in content process
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to load attacker-controlled web content that executes malicious WebAssembly in the affected Firefox/ESR build - i.e. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The input CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H = 9.8) treats this as unauthenticated remote code execution with no user interaction, but that conflicts with how a browser Wasm bug is actually triggered: exploitation realistically requires the victim to visit or render attacker-controlled content, i.e. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious web page containing crafted JavaScript and WebAssembly that manipulates object lifetimes to trigger the use-after-free, then lures a victim to visit it (or serves it via a malvertising frame). Reclaiming the freed memory with controlled data lets the attacker corrupt the heap to leak sensitive memory or execute code in the content process. …
Remediation Upgrade to a fixed build: Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1 (Vendor-released patch: Firefox 154 / ESR 140.14 / ESR 153.1), per the Mozilla Foundation Security Advisories at https://www.mozilla.org/security/advisories/mfsa2026-74/ and the related mfsa2026-76 through mfsa2026-80 pages. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, issue an urgent patch directive requiring all users to update Firefox to version 154 or Firefox ESR to version 140.14 or 153.1 depending on their deployment; for users unable to update immediately, restrict external web browsing to trusted domains only. …

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Same weakness CWE-416 – Use After Free

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Same technique Use After Free

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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-2026-60745 vulnerability details – vuln.today
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