Use-after-free 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

   Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

2. Jun 17, 2026 · NIST NVD

   Updated

   Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Affected

• cpe mozilla/firefoxversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-4723

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-4723

  Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

  nvd.nist.gov

References

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