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Vulnerability ID

CVE-2026-84118

AI Exploitable

Use-after-free in SpiderMonkey>GC

ProductFirefox

CVSS 3.1Medium5.4

EPSS0.29%

Has public PoCNo

AI Exploitability

A working PoC was successfully generated by AI

Working AI PoC: Yes
Cheapest run: $14.34
Fastest run: 1.9 hr

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

CWE: CWE-416
Weakness: Use After Free
Component: SpiderMonkey>GC
Impact: Not stated
Published: 2026-09-01
Fixed version: 155.0.0

Risk factors

In-the-WildNot observed

CISA KEVNot listed

Public ExploitNone known

Ransomware useNone known

Severity

CVSS 3.1Only version published

5.4Medium

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

Exploitability

Attack VectorNetwork

ComplexityLow

Privileges RequiredNone

User InteractionRequired

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

EPSS

Chance of exploitation in the next 30 days

0.29%

SSVC

Stakeholder-specific vulnerability categorization

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