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Vulnerability ID

CVE-2026-8388

Out-of-bounds access in SpiderMonkey>JIT

ProductFirefox

CVSS 3.1High7.5

EPSS0.24%

Has public PoCNo

AI Exploitability

No working AI exploit yet

Working AI PoC: Not yet
Cheapest run: $35.92
Fastest run: —

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Model Matrix Capability Breakdown Vulnerability Details Timeline Community

Overview

Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

CWE: CWE-119
Weakness: Improper Restriction of Operations within the Bounds of a Memory Buffer
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

0.24%

SSVC

Stakeholder-specific vulnerability categorization

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