CVE-2023-5856Network attack vector

Heap corruption via Side Panel use-after-free

Published Nov 1, 2023 · Updated Apr 29, 2025

Use-after-free in Google Chrome Side Panel before 119.0.6045.105 allows remote attackers to trigger heap corruption through crafted HTML. Public records identify the Side Panel object-lifetime error but do not disclose the freed object, code path, or operation that later reuses it. Exploitation requires a user to open attacker-controlled content and perform specific UI gestures; the resulting heap corruption can affect browser confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability1.18%
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 Google Chrome Side Panel before 119.0.6045.105 allows remote attackers to trigger heap corruption through crafted HTML. Public records identify the Side Panel object-lifetime error but do not disclose the freed object, code path, or operation that later reuses it. Exploitation requires a user to open attacker-controlled content and perform specific UI gestures; the resulting heap corruption can affect browser confidentiality, integrity, and availability.

The record

CVE
CVE-2023-5856
Published
Nov 1, 2023
Updated
Apr 29, 2025
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 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=119.0.6045.105 <119.0.6045.105

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=119.0.6045.105 <119.0.6045.105

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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.

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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