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Mozilla Firefox EUVDEUVD-2026-60670

| CVE-2026-74976 MEDIUM
Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)
2026-08-18 mozilla GHSA-8j76-jchm-gqf4
Memory Corruption Information Disclosure Mozilla Red Hat Suse
Medium
Disputed · 6.5 Vendor: mozilla
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Severity by source

Sources disagree (Low–High)
Vendor (mozilla) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Network-delivered via webpage (AV:N), no special configuration required (AC:L), no privileges needed (PR:N), single user interaction to visit page (UI:R), high confidentiality from memory read, no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
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:R/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Analysis Generated
Aug 19, 2026 - 13:42 vuln.today
CVSS changed
Aug 19, 2026 - 13:22 NVD
6.5 (MEDIUM)
CVE Published
Aug 18, 2026 - 12:23 cve.org
MEDIUM 6.5
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

JIT miscompilation in Firefox's SpiderMonkey JavaScript engine exposes sensitive memory to remote attackers via crafted web content. The CWE-843 (type confusion) root cause means the JIT compiler generates native code that accesses a JavaScript value as the wrong type, resulting in a high-confidentiality information disclosure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious webpage
Delivery
Deliver crafted JavaScript payload
Exploit
Trigger JIT miscompilation in SpiderMonkey
Execution
Read heap memory via type-confused access
Impact
Exfiltrate sensitive browser memory contents
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Vulnerability AssessmentAI

Exploitation The victim must use an unpatched version of Mozilla Firefox (any release prior to Firefox 154, ESR 140.14, or ESR 153.1) and must visit or be redirected to attacker-controlled web content that triggers the specific JIT miscompilation path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N scores 6.5 (Medium), reflecting a network-reachable flaw requiring only a single user interaction - visiting a malicious page - with no authentication prerequisite and high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious webpage containing crafted JavaScript designed to trigger the JIT miscompilation path in SpiderMonkey. When a victim navigates to the page in an unpatched Firefox browser, the JIT compiler processes the crafted script, accesses memory using an incompatible type, and the attacker's script reads out-of-bounds heap memory - potentially capturing sensitive data such as credentials, cryptographic material, or session tokens held in the browser process. …
Remediation The primary fix is to upgrade to Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1, as confirmed by Mozilla's security advisories (https://www.mozilla.org/security/advisories/mfsa2026-74/ and associated MFSAs). … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-843 – Access of Resource Using Incompatible Type (Type Confusion)

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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-2026-60670 vulnerability details – vuln.today
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