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Vulnerability ID

CVE-2026-74938

Protection mechanism failure in SpiderMonkey>GC

ProductFirefox

CVSS 3.1Critical9.1

EPSS0.44%

Has public PoCNo

AI Exploitability

No working AI exploit yet

Working AI PoC: Not yet
Cheapest run: $17.80
Fastest run: 1.6 hr

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

Mitigation bypass in the JavaScript: GC component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CWE: CWE-693
Weakness: Protection Mechanism Failure
Component: SpiderMonkey>GC
Impact: Not stated
Published: 2026-08-18
Fixed version: 154.0.0

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:H/A:N

Exploitability

Attack VectorNetwork

ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

EPSS

Chance of exploitation in the next 30 days

0.44%

SSVC

Stakeholder-specific vulnerability categorization

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