CVE-2025-13721Network attack vector

Heap corruption via V8 embedder-field race

Published Dec 2, 2025 · Updated Feb 26, 2026

Race condition in V8 in Google Chrome before 143.0.7499.41 allows remote attackers to corrupt heap memory via crafted HTML. JSObject::GetEmbedderFieldCount calculates the embedder-field count from map layout values without a stable snapshot, so a concurrent map change can produce an inconsistent result. A user must open the crafted page; successful exploitation corrupts the renderer heap, while execution beyond Chrome's sandbox is not established.

CVSS severity7.5
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in V8 in Google Chrome before 143.0.7499.41 allows remote attackers to corrupt heap memory via crafted HTML. JSObject::GetEmbedderFieldCount calculates the embedder-field count from map layout values without a stable snapshot, so a concurrent map change can produce an inconsistent result. A user must open the crafted page; successful exploitation corrupts the renderer heap, while execution beyond Chrome's sandbox is not established.

The record

CVE
CVE-2025-13721
Published
Dec 2, 2025
Updated
Feb 26, 2026
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-362, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=143.0.7499.41 <143.0.7499.41

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=143.0.7499.41 <143.0.7499.41

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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