CVE-2026-9986 — MEDIUM (4.2)

Q: How severe is CVE-2026-9986?

CVE-2026-9986 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-9986?

Check the references section above for vendor advisories and patch information. Affected products include: Google Chrome, Microsoft Windows, Apple Macos, Linux Linux Kernel.

Vulnerability Description

Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a crafted HTML page. (Chromium security severity: High)

CVSS Score

4.2

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

LOW

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Google	Chrome	< 148.0.7778.216
Microsoft	Windows	-
Apple	Macos	-
Linux	Linux Kernel	-

Related Weaknesses (CWE)

CWE-20

References

https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_Vendor Advisory
https://issues.chromium.org/issues/513028160Permissions Required

FAQ

What is CVE-2026-9986?

CVE-2026-9986 is a vulnerability with a CVSS score of 4.2 (MEDIUM). Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a...

How severe is CVE-2026-9986?

CVE-2026-9986 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-9986?

Check the references section above for vendor advisories and patch information. Affected products include: Google Chrome, Microsoft Windows, Apple Macos, Linux Linux Kernel.