CVE-2026-8388
MEDIUMCVSS 6.5/10EPSS 0.19%
Last modified
CVE-2026-8388 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.
Description
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 150.0.3 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2036978Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-8388?
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
How severe is CVE-2026-8388?
CVE-2026-8388 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2026-8388?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-8388?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST