CVE-2026-8390 — HIGH (7.3) — White Hats Nepal

Q: What is CVE-2026-8390?

CVE-2026-8390 is a vulnerability with a CVSS score of 7.3 (HIGH). Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

Q: How severe is CVE-2026-8390?

CVE-2026-8390 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-8390?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.

Vulnerability Description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

CVSS Score

7.3

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Affected Products

Vendor	Product	Versions
Mozilla	Firefox	< 150.0.3

Related Weaknesses (CWE)

CWE-416

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2038081Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory

FAQ

What is CVE-2026-8390?

CVE-2026-8390 is a vulnerability with a CVSS score of 7.3 (HIGH). Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

How severe is CVE-2026-8390?

CVE-2026-8390 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-8390?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.