CVE-2026-10966Network attack vector

Sandbox escape via crafted video file

Published Jun 4, 2026 · Updated Jun 4, 2026

Insufficient input validation in Google Chrome Codecs before 149.0.7827.53 allows remote attackers to escape the sandbox via a crafted video file. Google has not disclosed the specific parser, malformed field, or validation operation that permits the Codecs sandbox boundary to be crossed. Exploitation requires user interaction with attacker-supplied video content and grants execution outside the intended sandbox.

CVSS severity9.6
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient input validation in Google Chrome Codecs before 149.0.7827.53 allows remote attackers to escape the sandbox via a crafted video file. Google has not disclosed the specific parser, malformed field, or validation operation that permits the Codecs sandbox boundary to be crossed. Exploitation requires user interaction with attacker-supplied video content and grants execution outside the intended sandbox.

The record

CVE
CVE-2026-10966
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-20, T1211, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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=149.0.7827.53 <149.0.7827.53

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=149.0.7827.53 <149.0.7827.53

Published CVSS scores

9.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.6NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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-20Improper Input Validation
T1211Exploitation for Defense Evasion
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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