JIT miscompilation in the JavaScript Engine component.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Mar 24, 2026 · NIST NVD

   Detected

   JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

2. Jun 17, 2026 · NIST NVD

   Updated

   JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected

• cpe mozilla/firefoxversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-4702

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-4702

  JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

  nvd.nist.gov

References

• Permissions Required · bugzilla.mozilla.org
• Vendor Advisory · mozilla.org
• Vendor Advisory · mozilla.org
• Reference · mozilla.org
• Reference · mozilla.org