Affected: AlmaLinux:10: qt6-qt5compat, AlmaLinux:10: qt6-qt5compat-devel, AlmaLinux:10: qt6-qt5compat-examples

Qt6 - Qt 5 Compatibility Libraries.

Security Fix(es):

* qt: Qt: Denial of Service via out-of-bounds read in text codec handling (CVE-2026-9499)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x.

An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x.

Affected: openEuler:24.03-LTS-SP1: qt6-qt5compat

. Security Fix(es):

An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x.(CVE-2026-9499)

qt: Qt: Denial of Service via out-of-bounds read in text codec handling

qt: Qt: Denial of Service via out-of-bounds read in text codec handling

Affected: Rocky Linux:10: qt6-qt5compat

Qt6 - Qt 5 Compatibility Libraries.

Security Fix(es):

* qt: Qt: Denial of Service via out-of-bounds read in text codec handling (CVE-2026-9499)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Affected: Ubuntu:Pro:16.04:LTS: qtbase-opensource-src, Ubuntu:Pro:18.04:LTS: qtbase-opensource-src, Ubuntu:Pro:20.04:LTS: qtbase-opensource-src, Ubuntu:22.04:LTS: qt6-5compat, Ubuntu:Pro:22.04:LTS: qtbase-opensource-src, Ubuntu:24.04:LTS: qt6-5compat, Ubuntu:Pro:24.04:LTS: qtbase-opensource-src, Ubuntu:26.04:LTS: qt6-5compat, Ubuntu:26.04:LTS: qtbase-opensource-src

An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x.

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in QT ausnutzen, um einen Denial of Service Angriff durchzuführen.