CVE-2026-3921Network attack vector

Heap corruption via TextEncoding use-after-free

Published Mar 11, 2026 · Updated Mar 11, 2026

Use-after-free in TextEncoding in Google Chrome before 146.0.7680.71 allows remote attackers to corrupt heap memory via crafted HTML. TextEncoding reuses or dereferences memory after its lifetime has ended, although the public record does not identify the affected function or object-lifetime error. A user must load attacker-controlled HTML, and the documented consequence is heap corruption rather than a confirmed 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 TextEncoding in Google Chrome before 146.0.7680.71 allows remote attackers to corrupt heap memory via crafted HTML. TextEncoding reuses or dereferences memory after its lifetime has ended, although the public record does not identify the affected function or object-lifetime error. A user must load attacker-controlled HTML, and the documented consequence is heap corruption rather than a confirmed sandbox escape.

The record

CVE
CVE-2026-3921
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=146.0.7680.71 <146.0.7680.71

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=146.0.7680.71 <146.0.7680.71

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.

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Technologies

Your stack

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Your stack

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