CVE-2022-43591Public exploitNetwork attack vector

Code execution via unchecked spread-argument allocation

Published Jan 12, 2023 · Updated Apr 7, 2025

Heap-based buffer overflow in the Qt QML QtScript Reflect API in Qt 6.4 allows remote attackers to execute code via crafted QML. QV4::createSpreadArguments repeatedly calls scope.alloc for attacker-controlled spread-array elements without checking remaining runtime-stack space, overwriting adjacent memory. Execution requires a Qt application to load and run specifically crafted, untrusted QML, such as content reached through a malicious web page.

CVSS severity8.8
High
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in the Qt QML QtScript Reflect API in Qt 6.4 allows remote attackers to execute code via crafted QML. QV4::createSpreadArguments repeatedly calls scope.alloc for attacker-controlled spread-array elements without checking remaining runtime-stack space, overwriting adjacent memory. Execution requires a Qt application to load and run specifically crafted, untrusted QML, such as content reached through a malicious web page.

The record

CVE
CVE-2022-43591
Published
Jan 12, 2023
Updated
Apr 7, 2025
Vendor
The Qt Company
Product
Qt Framework
Classifications
CWE-122, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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=6.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Qt Company · Qt Frameworkversion=6.4

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8Cisco TalosCVSS:3.0/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 exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

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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