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Vulnerability ID

CVE-2026-117865

Use-after-free in SpiderMonkey>GC

ProductFirefox

CVSS 3.1Medium6.3

EPSS0.26%

Has public PoCNo

AI Exploitability

No working AI exploit yet

Working AI PoC: Not yet
Cheapest run: $33.61
Fastest run: —

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 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

CWE: CWE-416
Weakness: Use After Free
Component: SpiderMonkey>GC
Impact: Not stated
Published: 2026-10-27
Fixed version: 159

Risk factors

In-the-WildNot observed

CISA KEVNot listed

Public ExploitNone known

Ransomware useNone known

Severity

CVSS 3.1Only version published

6.3Medium

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

Exploitability

Attack VectorNetwork

ComplexityLow

Privileges RequiredNone

User InteractionRequired

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

EPSS

Chance of exploitation in the next 30 days

0.26%

SSVC

Stakeholder-specific vulnerability categorization

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