Qt up to 6.8.9/6.11.2/6.12.0 QXmlSimpleReader integer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Qt up to 6.8.9/6.11.2/6.12.0. Affected is an unknown function of the component QXmlSimpleReader. Executing a manipulation can lead to integer overflow. This vulnerability is tracked as CVE-2026-100140. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Qt up to 6.8.9/6.11.2/6.12.0. It has been declared as critical. This vulnerability affects some unknown functionality of the component QXmlSimpleReader. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An integer overflow vulnerability in the Qt XML parsing (Qt5Compat / QXmlSimpleReader) functionality of Qt.

The advisory is available at wiki.qt.io. This vulnerability was named CVE-2026-100140 since 09/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/02/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Qt

Version

• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.8.0
• 6.8.1
• 6.8.2
• 6.8.3
• 6.8.4
• 6.8.5
• 6.8.6
• 6.8.7
• 6.8.8
• 6.8.9
• 6.9
• 6.10
• 6.11
• 6.11.0
• 6.11.1
• 6.11.2
• 6.12.0

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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