PT-2026-61941 · Qt · Qt

CVE-2026-9499 · Publicado 2026-07-21 · Atualizado 2026-07-21

Mitre

CVSS v4.0

6.3

Média

Vetor base

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

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.

Correção

Out of bounds Read

Enumeração de Fraquezas

CWE-125

Identificadores relacionados

CVE-2026-9499

Produtos afetados

Qt

Referências · 5

• https://codereview.qt-project.org/c/qt/qt5compat/+/723911 · Correção
• https://codereview.qt-project.org/c/qt/qt5compat/+/724995 · Correção
• https://codereview.qt-project.org/c/qt/qt5compat/+/724348 · Correção
• https://nvd.nist.gov/vuln/detail/CVE-2026-9499 · Nota de Segurança
• https://codereview.qt-project.org/c/qt/tqtc-qt5compat/+/725112 · Correção