CVE-2022-40983: An integer overflow vulnerability exists in the QML QtScript Reflect API of Qt Project Qt 6.3.2

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HIGH 8.8DOWNGRADE

CVE-2022-40983 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.

An integer overflow vulnerability exists in the QML QtScript Reflect API of Qt Project Qt 6.3.2. A specially-crafted javascript code can trigger an integer overflow during memory allocation, 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	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-190
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 05:02 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-2022-40983?

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

Is CVE-2022-40983 being exploited?

CVE-2022-40983 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-2022-40983 affect?

CVE-2022-40983 affects qt. Severity is high (CVSS 8.8). An integer overflow vulnerability exists in the QML QtScript Reflect API of Qt Project Qt 6.3.2. A specially-crafted javascript code can trigger an integer overflow during memory allocation, which can lead to arbitrary code execution. Targe

How urgent is CVE-2022-40983?

Priority 52/100. High severity; Public exploit reference

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References

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