CVE-2026-100813

HIGH

Published Sep 29, 2026 Modified Sep 30, 2026 CWE-763

Description

Invalid pointer in the JavaScript Engine: JIT component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

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CVSS v3.1 Score

8.8

HIGH

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

Weakness Type (CWE)

CWE-763 CWE-763

References

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2068376 https://www.mozilla.org/security/advisories/mfsa2026-101/ https://www.mozilla.org/security/advisories/mfsa2026-97/

Frequently Asked Questions

What is CVE-2026-100813? +

Invalid pointer in the JavaScript Engine: JIT component. This vulnerability was fixed in Thunderbird 157 and Firefox 157. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-100813? +

CVE-2026-100813 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-100813? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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