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Review reviewHigh

CVE-2026-8389

Mozilla Firefox, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

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

CVSS
8.8
EPSS
0.33%
25.2% percentile
CISA KEV
Not listed
Published
2026.05.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.33%
Technical severityCVSS 8.8

Vulnerability overview

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

Affected product and versions

Product
Mozilla Firefox, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions
< 150.0.3
Fixed versions
150.0.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Mozilla Firefox, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
CWE-119, CWE-686, CWE-733, CWE-843
CVE-2026-8389 — Mozilla Firefox, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 | SECUFOCUS NOW