JIT miscompilation in the JavaScript Engine: JIT 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. Oct 13, 2026 · CIRCL Vulnerability Lookup

   Detected

   JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

2. Oct 15, 2026 · CIRCL Vulnerability Lookup

   Updated

   JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Affected

• vendor Mozilla Firefoxversion unspecified
• vendor Mozilla Thunderbirdversion unspecified

Sources

• CIRCL Vulnerability LookupVulnerability recordCVE-2026-109733

  JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

  vulnerability.circl.lu
• CVE.orgVulnerability recordCVE-2026-109733

  Official CVE identifier

  cve.org

References

• Reference · bugzilla.mozilla.org
• Reference · mozilla.org
• Reference · mozilla.org
• Reference · mozilla.org
• Reference · mozilla.org
• Reference · mozilla.org