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PatchSiren cyber security CVE debrief

CVE-2026-18017 Google CVE debrief

CVE-2026-18017 is a use-after-free vulnerability in Dawn within Google Chrome prior to version 151.0.7922.72. This vulnerability could allow a remote attacker to execute arbitrary code within a sandbox via a crafted HTML page. The CVSS score is 8.8, indicating a high severity level. The vulnerability exists in the Dawn component of Google Chrome, which is used for rendering web content. This issue arises when the program attempts to access memory that has already been freed, potentially leading to arbitrary code execution. Defenders should assess and mitigate this vulnerability, especially in environments exposed to untrusted web content.

Vendor
Google
Product
Chrome
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-30
Original CVE updated
2026-10-23
Advisory published
2026-07-30
Advisory updated
2026-10-23

Who should care

Defenders responsible for managing Google Chrome deployments, especially in environments exposed to untrusted web content, should assess and mitigate this vulnerability.

Why it matters

CVE-2026-18017 is a high-severity use-after-free vulnerability in Google Chrome's Dawn component. Defenders should prioritize patching to prevent potential arbitrary code execution within sandboxes via crafted HTML pages.

  • Potential for arbitrary code execution within a sandbox
  • Exposure to crafted HTML pages could lead to security bypass
  • High CVSS score indicating significant risk
  • Requires patching or mitigation to prevent exploitation

Technical summary

The vulnerability is a use-after-free issue in the Dawn component of Google Chrome. This could allow a remote attacker to execute arbitrary code within a sandbox via a crafted HTML page. The CVSS score is 8.8, indicating high severity. The Dawn component is responsible for rendering web content in Google Chrome. The use-after-free issue occurs when the program attempts to access memory that has already been freed. This vulnerability can be exploited through crafted HTML pages, potentially leading to arbitrary code execution within a sandbox.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially for systems and users exposed to untrusted web content.

Recommended defensive actions

  • Patch Google Chrome to version 151.0.7922.72 or later
  • Implement sandboxing and isolation for web applications
  • Monitor for suspicious web activity and crafted HTML pages
  • Review and update web content filtering and security policies

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and vector. Vendor advisories and release notes are available for further information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-18017 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-18017

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

  • CVE-2026-18017 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-18017

    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.