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Vulnerability ID

CVE-2026-74976

Type confusion in SpiderMonkey>JIT

ProductFirefox

CVSS 3.1Medium6.5

EPSS0.42%

Has public PoCNo

AI Exploitability

No working AI exploit yet

Working AI PoC: Not yet
Cheapest run: $25.03
Fastest run: —

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

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

CWE: CWE-843
Weakness: Access of Resource Using Incompatible Type ('Type Confusion')
Component: SpiderMonkey>JIT
Impact: Not stated
Published: 2026-08-18
Fixed version: 154

Risk factors

In-the-WildNot observed

CISA KEVNot listed

Public ExploitNone known

Ransomware useNone known

Severity

CVSS 3.1Only version published

6.5Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Exploitability

Attack VectorNetwork

ComplexityLow

Privileges RequiredNone

User InteractionRequired

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

EPSS

Chance of exploitation in the next 30 days

0.42%

SSVC

Stakeholder-specific vulnerability categorization

Not scored. CISA publishes an SSVC decision for a subset of CVEs.