CVE-2026-12437: Use after free in WebShare
Chromium: CVE-2026-12437 Use after free in WebShare
Other sources
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
Use after free in WebShare in Google Chrome on Windows prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)
— NVD
Credit
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 149.0.7827.155 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 149.0.4022.80 - Upgrade
Upgrade
Google Chrome (Chromium)to a version that resolves this vulnerability.Fixed in 149.0.7827.155 - Compensating control
If you cannot immediately upgrade, reduce exposure by preventing untrusted or user-supplied HTML pages from being opened in the affected Chromium renderer sandbox (e.g., block/limit rendering of attacker-controlled web content until patched).
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-12438
- CVE-2026-12439
- CVE-2026-12440
- CVE-2026-12441
- CVE-2026-12442
- CVE-2026-12443
- CVE-2026-12444
- CVE-2026-12445
- CVE-2026-12446
- CVE-2026-12447
- CVE-2026-12448
- CVE-2026-12449
- CVE-2026-12450
- CVE-2026-12451
- CVE-2026-12452
- CVE-2026-12453
- CVE-2026-12454
- CVE-2026-12455
- CVE-2026-12456
- CVE-2026-12457
- CVE-2026-12458
- CVE-2026-12459
- CVE-2026-12460
- CVE-2026-12461
- CVE-2026-12462
- CVE-2026-12463
- CVE-2026-12464
- CVE-2026-12465
- CVE-2026-12466
- CVE-2026-12467
- CVE-2026-12468
- CVE-2026-12469
Frequently Asked Questions
What is the severity of CVE-2026-12437?
CVE-2026-12437 has a high severity rating of 8.3 according to CVSS 3.1.
How do I fix CVE-2026-12437?
To fix CVE-2026-12437, update your Google Chrome or Microsoft Edge to the latest available version.
What causes CVE-2026-12437?
CVE-2026-12437 is caused by a use after free vulnerability in the WebShare feature of Google Chrome.
Which software is affected by CVE-2026-12437?
CVE-2026-12437 affects Google Chrome versions prior to 149.0.782 and Microsoft Edge (Chromium-based) versions that include Chromium.
Is CVE-2026-12437 a critical vulnerability?
Yes, CVE-2026-12437 is considered critical because it can allow attackers to execute arbitrary code on the affected system.