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Vulnerability ID

CVE-2026-8389

AI Exploitable

Function call with incorrect argument type in SpiderMonkey>JIT

ProductFirefox

CVSS 3.1High7.5

EPSS0.42%

Has public PoCNo

AI Exploitability

A working PoC was successfully generated by AI

Working AI PoC: Yes
Cheapest run: $10.47
Fastest run: 47 min

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 150.0.3.

CWE: CWE-686
Weakness: Function Call With Incorrect Argument Type
Component: SpiderMonkey>JIT
Impact: Not stated
Published: 2026-05-12
Fixed version: 150.0.3

Risk factors

In-the-WildNot observed

CISA KEVNot listed

Public ExploitNone known

Ransomware useNone known

Severity

CVSS 3.1Only version published

7.5High

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

Exploitability

Attack VectorNetwork

ComplexityHigh

Privileges RequiredNone

User InteractionRequired

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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.