CVE-2025-9479Network attack vector

Heap corruption via V8 out-of-bounds read

Published Nov 14, 2025 · Updated Nov 14, 2025

Out-of-bounds read in V8 in Google Chrome before 133.0.6943.141 allows remote attackers to corrupt the heap via a crafted HTML page. Google has not disclosed the V8 operation or object-handling error that reads beyond its intended memory boundary. Exploitation requires a user to open the crafted page, and the published assessment limits the resulting impact to a browser hang or crash.

CVSS severity4.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in V8 in Google Chrome before 133.0.6943.141 allows remote attackers to corrupt the heap via a crafted HTML page. Google has not disclosed the V8 operation or object-handling error that reads beyond its intended memory boundary. Exploitation requires a user to open the crafted page, and the published assessment limits the resulting impact to a browser hang or crash.

The record

CVE
CVE-2025-9479
Published
Nov 14, 2025
Updated
Nov 14, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-125, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 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=133.0.6943.141 <133.0.6943.141

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=133.0.6943.141 <133.0.6943.141

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

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-125Out-of-bounds Read
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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