CVE-2025-10890Network attack vector

Cross-origin data disclosure via V8 side channel

Published Sep 24, 2025 · Updated Sep 24, 2025

Side-channel information leakage in V8 in Google Chrome before 140.0.7339.207 allows remote attackers to read cross-origin data via crafted HTML. Google identifies V8 as the affected component but keeps the underlying bug record restricted, so the observable operation that leaks the data is undisclosed. Exploitation requires the targeted browser to process attacker-controlled HTML; the documented consequence is cross-origin data disclosure, not code execution or service interruption.

CVSS severity9.1
Critical
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

Side-channel information leakage in V8 in Google Chrome before 140.0.7339.207 allows remote attackers to read cross-origin data via crafted HTML. Google identifies V8 as the affected component but keeps the underlying bug record restricted, so the observable operation that leaks the data is undisclosed. Exploitation requires the targeted browser to process attacker-controlled HTML; the documented consequence is cross-origin data disclosure, not code execution or service interruption.

The record

CVE
CVE-2025-10890
Published
Sep 24, 2025
Updated
Sep 24, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-1300, CWE-203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2025Record 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=140.0.7339.207 <140.0.7339.207

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=140.0.7339.207 <140.0.7339.207

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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-1300Improper Protection of Physical Side Channels
CWE-203Observable Discrepancy

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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