CVE-2026-8389

JIT miscompilation in the JavaScript Engine: JIT component

CVSS 8.8 HIGHEPSS 0.3%CWE-119 CWE-686 CWE-843

Vexday Risk Score

41Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 8.8EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

12 May 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

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

Affected products

public PoCs found — 1

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References