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Vulnerability ID

CVE-2026-4716

Uninitialized memory in SpiderMonkey

ProductFirefox

CVSS 3.1Critical9.1

EPSS0.42%

Has public PoCNo

AI Exploitability

No working AI exploit yet

Working AI PoC: Not yet
Cheapest run: $6.51
Fastest run: 56 min

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CWE: CWE-908
Weakness: Use of Uninitialized Resource
Component: SpiderMonkey
Impact: Not stated
Published: 2026-03-24
Fixed version: 149.0

Risk factors

In-the-WildNot observed

CISA KEVNot listed

Public ExploitNone known

Ransomware useNone known

Severity

CVSS 3.1Only version published

9.1Critical

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

Exploitability

Attack VectorNetwork

ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

ConfidentialityHigh

IntegrityNone

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.