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PatchSiren cyber security CVE debrief

CVE-2026-6305 Google CVE debrief

CVE-2026-6305 debrief: Google Chrome PDFium heap buffer overflow allows remote code execution inside a sandbox via crafted PDF files. This high-severity vulnerability affects Chrome users, particularly those handling PDF files from untrusted sources. To mitigate the vulnerability, Chrome users should assess their exposure and update to version 147.0.7727.101 or later. The vulnerability requires verification of Chrome version and monitoring for suspicious PDF file activity. It is crucial for organizations to prioritize updating Chrome to prevent potential attacks.

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

Chrome users, especially those handling PDF files from untrusted sources, should assess exposure and update Chrome to 147.0.7727.101 or later.

Why it matters

CVE-2026-6305 is a high-severity vulnerability in Google Chrome's PDFium component that allows remote attackers to execute arbitrary code inside a sandbox via crafted PDF files. Chrome users, especially those handling PDF files from untrusted sources, should assess exposure and update Chrome to 147.0.7727.101 or later. The vulnerability requires verification of Chrome version and monitoring for suspicious PDF file activity.

  • Remote code execution inside a sandbox via crafted PDF files.
  • Potential for attackers to execute arbitrary code within the Chrome sandbox.
  • Need for Chrome updates to 147.0.7727.101 or later to mitigate the vulnerability.
  • Verification of Chrome version and monitoring for suspicious PDF file activity required.

Technical summary

A heap buffer overflow vulnerability exists in PDFium in Google Chrome prior to 147.0.7727.101. This issue allows remote attackers to execute arbitrary code inside a sandbox via a crafted PDF file. The vulnerability is a result of insufficient validation of user-supplied input, leading to a buffer overflow. Chrome users, especially those handling PDF files from untrusted sources, should verify their Chrome version and update to 147.0.7727.101 or later to mitigate the vulnerability.

Defensive priority

High

Recommended defensive actions

  • Assess exposure for Chrome users, especially those handling PDF files from untrusted sources.
  • Verify Chrome version and update to 147.0.7727.101 or later.
  • Implement sandboxing and restrict access to sensitive data and systems.
  • Monitor for suspicious PDF file activity and implement network traffic monitoring.

Evidence notes

Official CVE and NVD records detail a heap buffer overflow in PDFium in Google Chrome prior to 147.0.7727.101. The issue allows remote attackers to execute arbitrary code inside a sandbox via crafted PDF files.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6305 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6305

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

  • CVE-2026-6305 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6305

    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.