CVE-2026-9986: High Insufficient validation of untrusted input in OptimizationGuide
Chromium: CVE-2026-9986 Insufficient validation of untrusted input in OptimizationGuide
Other sources
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)
— NVD
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
— Microsoft
Credit
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Chromium / Google Chrometo a version that resolves this vulnerability.Fixed in 148.0.7778.216 - Upgrade
Upgrade
Microsoft Edge (Chromium-based)to a version that resolves this vulnerability.Fixed in 148.0.7778.216
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-11669
- CVE-2026-8513
- CVE-2026-9979
- CVE-2026-10982
- CVE-2026-11693
- CVE-2026-11694
- CVE-2026-11660
- CVE-2026-11697
- CVE-2026-11692
- CVE-2026-11670
- CVE-2026-11646
- CVE-2026-11683
- CVE-2026-11689
- CVE-2026-9952
- CVE-2026-11651
- CVE-2026-10981
- CVE-2026-11682
- CVE-2026-11674
- CVE-2026-10988
- CVE-2026-11662
- CVE-2026-15901
- CVE-2026-7357
- CVE-2026-9985
- CVE-2026-15765
- CVE-2026-13860
- CVE-2026-15133
- CVE-2026-10888
- CVE-2026-15129
Frequently Asked Questions
What is the severity of CVE-2026-9986?
CVE-2026-9986 has a medium severity rating of 4.2 according to the CVSS 3.1 system.
How do I fix CVE-2026-9986?
To fix CVE-2026-9986, update Google Chrome or Microsoft Edge to the latest version available, specifically version 148.0.7778.216 or later.
What impact does CVE-2026-9986 have on my system?
CVE-2026-9986 can allow remote attackers to perform UI spoofing, potentially misleading users with untrusted content.
Which software is affected by CVE-2026-9986?
CVE-2026-9986 affects Google Chrome prior to version 148.0.7778.216 and Microsoft Edge browsers that are based on Chromium.
What is the nature of CVE-2026-9986?
CVE-2026-9986 involves insufficient validation of untrusted input in the OptimizationGuide component of affected browsers.