CVE-2007-4137: Trolltech Qt

High severity, CVSS 7.5. EPSS: 2.3% chance of exploitation in the next 30 days.

Off-by-one error in the QUtf8Decoder::toUnicode function in Trolltech Qt 3 allows context-dependent attackers to cause a denial of service (crash) via a crafted Unicode string that triggers a heap-based buffer overflow. NOTE: Qt 4 has the same error in the QUtf8Codec::convertToUnicode function, but it is not exploitable.

Affected products

• Trolltech Qt: version 3.0 only; version 3.0.3 only; version 3.0.5 only; version 3.1 only; version 3.1.1 only; version 3.1.2 only; …

Published 2007-09-18. Last modified 2026-06-16.