CVE-2026-6305Network attack vector

Sandboxed code execution via crafted PDF

Published Apr 15, 2026 · Updated Apr 15, 2026

Heap buffer overflow in PDFium in Google Chrome before 147.0.7727.101 allows remote attackers to execute code via a crafted PDF file. Google identifies the faulty component only as PDFium; the restricted issue does not disclose which parser operation writes beyond its allocated heap buffer. A user must open or render attacker-controlled PDF content, and resulting code execution remains inside Chrome's sandbox.

CVSS severity8.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in PDFium in Google Chrome before 147.0.7727.101 allows remote attackers to execute code via a crafted PDF file. Google identifies the faulty component only as PDFium; the restricted issue does not disclose which parser operation writes beyond its allocated heap buffer. A user must open or render attacker-controlled PDF content, and resulting code execution remains inside Chrome's sandbox.

The record

CVE
CVE-2026-6305
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-122, CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=147.0.7727.101 <147.0.7727.101

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=147.0.7727.101 <147.0.7727.101

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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