CVE-2026-9986
published 2026-05-28CVE-2026-9986: Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the…
PriorityP419medium4.2CVSS 3.1
AVNACHPRNUIRSUCLINAL
EPSS
0.14%
4.2th percentile
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)
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| chrome | < 148.0.7778.216 | 148.0.7778.216 | |
| chrome | < 148.0.7778.215 | 148.0.7778.215 | |
| chrome | >= 148.0.7778.216 < 148.0.7778.216 | 148.0.7778.216 | |
| chrome_desktop | — | — | |
| paloalto | prisma_browser | — | — |
CVSS provenance
nvdv3.14.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
vendor_redhat4.2MEDIUM
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Palo Alto
PAN-SA-2026-0008 Chromium: Monthly Vulnerability Update (June 2026)
vendor_paloalto·2026-06-10·CVSS 8.8
CVE-2026-8509 [HIGH] PAN-SA-2026-0008 Chromium: Monthly Vulnerability Update (June 2026)
PAN-SA-2026-0008 Chromium: Monthly Vulnerability Update (June 2026)
Palo Alto Networks incorporated the following Chromium security fixes into our products: https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193308.html https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html CVE Summary CVE-2026-8509 Heap buffer overflow in WebML CVE-2026-8510 Integer overflow in Skia CVE-2026-8511 Use after free in UI CVE-2026-8512 Use after free in FileSystem CVE-2026-8513 Use after free in Input CVE-2026-8514 Use after free in Aura CVE-2026-8515 Use after free
Red Hat
chromium-browser: Insufficient validation of untrusted input in OptimizationGuide
vendor_redhat·2026-05-27·CVSS 4.2
CVE-2026-9986 [MEDIUM] CWE-1289 chromium-browser: Insufficient validation of untrusted input in OptimizationGuide
chromium-browser: Insufficient validation of untrusted input in OptimizationGuide
An insufficient validation of untrusted input flaw was found in the OptimizationGuide component of the Chromium browser.
Upstream bug(s):
https://code.google.com/p/chromium/issues/detail?id=513028160
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Chrome
Stable Channel Update for Desktop: CVE-2026-9986
vendor_chrome·2026-05-27
CVE-2026-9986 [HIGH] Stable Channel Update for Desktop: CVE-2026-9986
Stable Channel Update for Desktop
CVE-2026-9986: Insufficient validation of untrusted input in OptimizationGuide. Reported by Google on 2026-05-14 [N/A][ 513046475 ] High CVE-2026-9987: Insufficient validation of untrusted input in WebAppInstalls
Reported by Google on 2026-05-14 [N/A][ 513049286 ] High CVE-2026-9988: Use after free in WebRTC
Severity: high
GHSA
GHSA-g8q5-42mc-pjxg: Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148
ghsa_unreviewed·2026-05-29
CVE-2026-9986 [MEDIUM] CWE-20 GHSA-g8q5-42mc-pjxg: Insufficient validation of untrusted input in OptimizationGuide in Google Chrome prior to 148
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)
No detection rules found.
No public exploits indexed.
2026-05-28
Published