CVE-2026-9986

Chromium: CVE-2026-9986 Insufficient validation of untrusted input in OptimizationGuide

CVE-2026-9986 is fixed in 9 products on 3 platforms, first by Google Chrome Dev (EXE) 149.0.7779.3, released April 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

RoutineFixed on 3 platforms

CVSS

4.2

medium

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0015

3rd percentile

<p>This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see <a href="https://chromereleases.googleblog.com/2021">Google Chrome Releases</a> for more information.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Google Chrome (EXE)	148.0.7778.217	Google Chrome (EXE) 148.0.7778.217	May 27, 2026
Google Chrome Beta (EXE)	149.0.7827.3	Google Chrome Beta (EXE) 149.0.7827.3	May 6, 2026
Google Chrome Dev (EXE)	149.0.7779.3	Google Chrome Dev (EXE) 149.0.7779.3	Apr 9, 2026
Microsoft Edge	148.0.3967.96	Microsoft Edge 148.0.3967.96	May 28, 2026
Microsoft Edge Beta	151.0.4129.59	Microsoft Edge Beta 151.0.4129.59	Jul 31, 2026
Microsoft Edge Dev	152.0.4167.0	Microsoft Edge Dev 152.0.4167.0	Jul 20, 2026
Microsoft Edge WebView2 Runtime	148.0.3967.96	Microsoft Edge WebView2 Runtime 148.0.3967.96	May 28, 2026
macOS
Google Chrome	148.0.7778.216	Google Chrome 148.0.7778.216	May 26, 2026
Microsoft Edge	149.0.4022.80	Microsoft Edge 149.0.4022.80	Jun 17, 2026
Linux
chromium · Debian 12.15 (bookworm)	148.0.7778.215-1~deb12u1	DEBIAN-CVE-2026-9986	Jun 24, 2026
chromium · Debian 13.5 (trixie)	148.0.7778.215-1~deb13u1	DEBIAN-CVE-2026-9986	Jun 24, 2026
chromium · Debian 14	148.0.7778.215-1	DEBIAN-CVE-2026-9986	Jun 24, 2026
chromium · opensuse-leap 16.0	148.0.7778.215-bp160.1.1	OPENSUSE-SU-2026:20849-1	Aug 31, 2026

Details

Published
May 28, 2026
Weakness
CWE-20: Insufficient validation of untrusted input
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-9986

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-9986">CVE-2026-9986 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.