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PatchSiren cyber security CVE debrief

CVE-2026-6303 Google CVE debrief

CVE-2026-6303 is a use-after-free vulnerability in Google Chrome's Codecs component, which could allow remote attackers to execute arbitrary code within a sandbox via a crafted HTML page. This issue was addressed in Chrome version 147.0.7727.101. The vulnerability is high-severity and affects Google Chrome's Codecs component. IT and security teams managing Chrome installations should assess exposure and update or patch vulnerable versions to prevent potential exploitation. The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions.

Vendor
Google
Product
Chrome
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-15
Original CVE updated
2026-10-26
Advisory published
2026-04-15
Advisory updated
2026-10-26

Who should care

IT and security teams responsible for managing Google Chrome installations should assess their exposure and take necessary actions to update or patch vulnerable versions.

Why it matters

CVE-2026-6303 is a high-severity vulnerability in Google Chrome's Codecs component that could allow remote attackers to execute arbitrary code within a sandbox. IT and security teams managing Chrome installations should assess exposure and update or patch vulnerable versions to prevent potential exploitation.

  • Remote code execution within a sandbox
  • Potential for attacker exploitation
  • Need for Chrome version updates or patches

Technical summary

The vulnerability is a use-after-free issue in the Codecs component of Google Chrome. This could allow a remote attacker to execute arbitrary code within a sandbox via a crafted HTML page. The issue was addressed in Chrome version 147.0.7727.101. The vulnerability is a high-severity issue that could allow remote attackers to execute arbitrary code within a sandbox. The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions.

Defensive priority

High

Recommended defensive actions

  • Assess exposure: Review Chrome versions in your environment and ensure they are updated to 147.0.7727.101 or later.
  • Verify inventory: Check for Chrome installations and update or patch vulnerable versions.
  • Monitor for suspicious activity: Keep an eye on Chrome logs and network traffic for potential exploitation attempts.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. However, the corpus does not provide explicit information on the number of affected users or specific attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6303 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6303

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

  • CVE-2026-6303 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6303

    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.