Vulnerability Report

CVE-2026-8389

Title: JIT miscompilation in JavaScript Engine

Memory Corruption

Proof Of Concept

PoC Available for CVE-2026-8389

CWE Category NVD-CWE-noinfo

Published Date May 12, 2026

Modified Date Jun 05, 2026

Exploit Status Available

Score 8.8 CVSS v

Exploit Probability (EPSS)

0.31%

Vulnerability Summary

CVE-2026-8389: JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

Impacted Vendors

mozilla 1

Reference Links

https://bugzilla.mozilla.org/show_bug.cgi?id=2036983 https://www.mozilla.org/security/advisories/mfsa2026-45/

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity HIGH

8.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-8389 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/crixpwn/CVE-2026-8389

View Code

June 05, 2026 MODIFIED

Vulnerability data updated via NVD.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

May 12, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.