CVE-2026-9963: Chromium: CVE-2026-9963 Uninitialized Use in iOS
CVE-2026-9963 is an edge - chromium vulnerability in Chromium. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.28% probability of exploitation activity in the next 30 days, higher than 20% of all scored vulnerabilities. Microsoft released the fix on 31 May 2026 in the May 2026 Patch Tuesday. It affects 1 product in 1 product family (Browser).
Key facts
- CVE ID
- CVE-2026-9963
- Severity
- N/A
- Impact
- Edge - Chromium
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-457
- EPSS
- 0.28% (percentile 20%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- May 2026 Patch Tuesday
- Product families
- Browser
Description
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
Frequently asked questions (Microsoft)
What is the version information for this release?
Microsoft Edge Version
Date Released
Based on Chromium Version
148.0.3967.97
05/31/2026
148.0.7778.216/217
Why is this Chrome CVE included in the Security Update Guide?
The vulnerability assigned to this CVE is in Chromium Open Source Software (OSS) which is consumed by Microsoft Edge (Chromium-based). It is being documented in the Security Update Guide to announce that the latest version of Microsoft Edge (Chromium-based) is no longer vulnerable.
How can I see the version of the browser?
- In your Microsoft Edge browser, click on the 3 dots (...) on the very right-hand side of the window
- Click on Help and Feedback
- Click on About Microsoft Edge
Affected products (1)
Browser
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Microsoft Edge (Chromium-based) | Release Notes | Security Update | 148.0.3967.97 | No |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 7.5 (HIGH)
- NVD weakness
- CWE-457
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| chrome | before 148.0.7778.216 |
References
- https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html (Release Notes)
- https://issues.chromium.org/issues/505143241 (Permissions Required, Vendor Advisory)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |