CVE-2022-43591: A buffer overflow vulnerability exists in the QML QtScript Reflect API of Qt Project Qt 6.3.2

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HIGH 8.8DOWNGRADE

CVE-2022-43591 is a high-severity flaw (CVSS 8.8) affecting qt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A buffer overflow vulnerability exists in the QML QtScript Reflect API of Qt Project Qt 6.3.2. A specially-crafted javascript code can trigger an out-of-bounds memory access, which can lead to arbitrary code execution. Target application would need to access a malicious web page to trigger this vulnerability.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-122
Published	2023-01-12
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: qt

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-12 17:15 UTCPublished CVE record published
2026-06-17 05:06 UTCUpdated Record last modified

qt qt DOWNGRADE

Affected: 6.3.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.3.2

1. Check installed version

apt-cache policy qt || rpm -q qt || qt --version

2. No fixed release: DOWNGRADE to a release before 6.3.2 (Debian / Ubuntu)

apt-cache madison qt sudo apt install qt=<VERSION_BEFORE_6.3.2> sudo apt-mark hold qt

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list qt sudo dnf downgrade qt-<VERSION_BEFORE_6.3.2> sudo dnf versionlock add qt

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-43591?

qt: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-43591 being exploited?

CVE-2022-43591 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-43591 affect?

CVE-2022-43591 affects qt. Severity is high (CVSS 8.8). A buffer overflow vulnerability exists in the QML QtScript Reflect API of Qt Project Qt 6.3.2. A specially-crafted javascript code can trigger an out-of-bounds memory access, which can lead to arbitrary code execution. Target application wo

How urgent is CVE-2022-43591?

Priority 53/100. High severity; Public exploit reference

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References

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