CVE-2023-5218Network attack vector

Heap corruption via Site Isolation use-after-free

Published Oct 11, 2023 · Updated Apr 30, 2025

Use after free in Site Isolation in Google Chrome before 118.0.5993.70 allows remote attackers to corrupt heap memory via crafted HTML. Site Isolation accesses an object after its memory has been freed, leaving subsequent object use able to corrupt the heap; the affected function is undisclosed. Exploitation requires a user to load attacker-controlled HTML and can compromise browser-process confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability1.30%
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 Site Isolation in Google Chrome before 118.0.5993.70 allows remote attackers to corrupt heap memory via crafted HTML. Site Isolation accesses an object after its memory has been freed, leaving subsequent object use able to corrupt the heap; the affected function is undisclosed. Exploitation requires a user to load attacker-controlled HTML and can compromise browser-process confidentiality, integrity, and availability.

The record

CVE
CVE-2023-5218
Published
Oct 11, 2023
Updated
Apr 30, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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=118.0.5993.70 <118.0.5993.70

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=118.0.5993.70 <118.0.5993.70

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1189Drive-by Compromise

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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