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CVE-2026-110921 Google CVE debrief

CVE-2026-110921 debrief: Google Chrome V8 use after free vulnerability allows remote code execution. The vulnerability, tracked as CVE-2026-110921, is a high-severity use after free issue in the V8 engine of Google Chrome. This type of vulnerability occurs when the software attempts to use memory after it has been freed, which can lead to arbitrary code execution. In this case, an attacker could exploit the vulnerability by crafting a malicious HTML page that, when opened in a vulnerable version of Chrome, would allow the attacker to execute arbitrary code inside the sandbox. The sandbox is a security feature that isolates web page execution, preventing malicious code from escaping

Vendor
Google
Product
Chrome
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-15
Original CVE updated
2026-10-16
Advisory published
2026-10-15
Advisory updated
2026-10-16

Who should care

Chrome users, particularly those with high-risk browsing habits or in sensitive environments, should assess exposure and update to the latest version.

Why it matters

CVE-2026-110921 is a high-severity use after free vulnerability in Google Chrome's V8 engine, allowing remote code execution inside the sandbox. Chrome users, especially those in sensitive environments, should update to version 155.0.8059.84 or later to mitigate potential exploitation. The vulnerability's impact is limited to the sandbox, but its high severity and potential for exploitation require prompt attention.

  • Remote code execution inside the sandbox
  • Potential for attacker exploitation
  • Need for Chrome version verification
  • High severity vulnerability requiring prompt attention

Technical summary

A use after free vulnerability in V8 in Google Chrome prior to 155.0.8059.84 allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. The vulnerability is caused by the improper handling of memory in the V8 engine, which can lead to arbitrary code execution. The vulnerability is rated as high severity and requires prompt attention. Chrome users, especially those in sensitive environments, should update to version 155.0.8059.84 or later to mitigate potential exploitation. The vulnerability's impact is limited to the sandbox,

Defensive priority

High priority for Chrome users to update to version 155.0.8059.84 or later.

Recommended defensive actions

  • Update Google Chrome to version 155.0.8059.84 or later
  • Review and verify Chrome version in use
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and exploitation is limited. The CVE record was published on 2026-10-15T22:19:27.473Z and has not been modified since then. There are references to the official CVE Program record and the NIST NVD detail page, which provide source-provided CVE metadata and source-specific vulnerability assessments. However, there is no information on whether the vulnerability has been seen

Sources and references

Verified primary and authoritative sources

  • CVE-2026-110921 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-110921

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-110921 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-110921

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.