CVE-2026-6303Network attack vector

Sandboxed code execution via Codecs use-after-free

Published Apr 15, 2026 · Updated Apr 15, 2026

Use after free in Google Chrome Codecs before 147.0.7727.101 allows remote attackers to execute code in the sandbox via crafted HTML. Chrome's public advisory identifies the Codecs component but keeps the underlying bug details restricted, so the freed object and invalid reuse operation are undisclosed. A target must open attacker-controlled HTML; successful exploitation provides code execution inside the renderer sandbox, with no reported sandbox escape.

CVSS severity8.8
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use after free in Google Chrome Codecs before 147.0.7727.101 allows remote attackers to execute code in the sandbox via crafted HTML. Chrome's public advisory identifies the Codecs component but keeps the underlying bug details restricted, so the freed object and invalid reuse operation are undisclosed. A target must open attacker-controlled HTML; successful exploitation provides code execution inside the renderer sandbox, with no reported sandbox escape.

The record

CVE
CVE-2026-6303
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-416, 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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
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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