CVE-2026-113261 Google CVE debrief

Who should care

Google Chrome users, particularly those with versions prior to 156.0.8078.47, should assess exposure and verify if their browser is updated to the latest version. IT teams and security professionals responsible for managing Google Chrome deployments should prioritize updating to the latest version and review system logs for suspicious activity. Additionally, defenders should verify that their systems are not exposed to this vulnerability and take steps to

Why it matters

CVE-2026-113261 is a medium-severity vulnerability in Google Chrome that allows remote attackers to potentially execute arbitrary code outside the sandbox. Defenders should assess exposure, verify browser versions, and update to the latest version to prevent potential exploitation.

• Potential execution of arbitrary code outside the sandbox
• Remote attackers may exploit this vulnerability via crafted HTML pages
• Defenders should verify Google Chrome versions and update to 156.0.8078.47 or later

Technical summary

CVE-2026-113261 is a use-after-free vulnerability in WebAppInstalls in Google Chrome prior to 156.0.8078.47. This vulnerability allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. The vulnerability is considered medium-severity and defenders should prioritize updating Google Chrome to the latest version to prevent potential exploitation. The CVE record and NVD detail page provide additional technical information about the vulnerability. Defenders should review system logs and verify browser versions to ensure they are not exposed to this vulnerability.

Defensive priority

Medium

Recommended defensive actions

• Assess exposure to Google Chrome version 156.0.8078.47 and earlier
• Verify if Google Chrome is updated to the latest version
• Monitor Google Chrome for any suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE Program record and NVD vulnerability detail page provide official information about CVE-2026-113261, a use-after-free vulnerability in WebAppInstalls in Google Chrome prior to 156.0.8078.47. The evidence is limited to publicly available records and may not reflect the full scope of affected systems or potential impacts. Defenders should verify Google Chrome versions and review system logs for suspicious activity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.