CVE-2026-11683Network attack vector

Sandboxed code execution via WebCodecs use-after-free

Published Jun 8, 2026 · Updated Jun 8, 2026

Use after free in WebCodecs in Google Chrome before 149.0.7827.103 allows remote attackers to execute code in the sandbox via crafted HTML. Google has not published the affected WebCodecs object, lifetime transition, or stale-reference operation because the Chromium issue remains restricted. A user must load attacker-controlled HTML; successful exploitation runs arbitrary code within Chrome's sandbox, with no documented sandbox escape.

CVSS severity8.8
High
EPSS probability0.31%
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 WebCodecs in Google Chrome before 149.0.7827.103 allows remote attackers to execute code in the sandbox via crafted HTML. Google has not published the affected WebCodecs object, lifetime transition, or stale-reference operation because the Chromium issue remains restricted. A user must load attacker-controlled HTML; successful exploitation runs arbitrary code within Chrome's sandbox, with no documented sandbox escape.

The record

CVE
CVE-2026-11683
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 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=149.0.7827.103 <149.0.7827.103

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=149.0.7827.103 <149.0.7827.103

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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