{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9499","assignerOrgId":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","state":"PUBLISHED","assignerShortName":"TQtC","dateReserved":"2026-05-25T09:55:56.600Z","datePublished":"2026-07-21T13:25:27.477Z","dateUpdated":"2026-07-22T18:28:22.217Z"},"containers":{"cna":{"providerMetadata":{"orgId":"a59d8014-47c4-4630-ab43-e1b13cbe58e3","shortName":"TQtC","dateUpdated":"2026-07-21T13:25:27.477Z"},"title":"Out-of-bounds read in QTextCodec::codecForName() in Qt","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-540","descriptions":[{"lang":"en","value":"CAPEC-540 Overread Buffers"}]}],"affected":[{"vendor":"Qt","product":"Qt","modules":["Qt5Compat (Core5Compat)"],"versions":[{"status":"affected","version":"6.0.0","lessThan":"6.8.8","versionType":"python"},{"status":"affected","version":"6.9.0","lessThan":"6.11.1","versionType":"python"}],"defaultStatus":"unaffected","cpes":["cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*"]},{"vendor":"Qt","product":"Qt","modules":["qtbase"],"versions":[{"status":"affected","version":"4.0.0","lessThan":"6.0.0","versionType":"python"}],"defaultStatus":"unaffected","cpes":["cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*"]}],"cpeApplicability":[{"operator":"OR","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.0","versionEndExcluding":"6.8.8"},{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9.0","versionEndExcluding":"6.11.1"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0.0","versionEndExcluding":"6.0.0"}]}]}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"An out-of-bounds read (buffer over-read) vulnerability exists in <code>QTextCodec::codecForName()</code> in Qt. When the function is called with a <code>QByteArray</code> that is not NUL-terminated (for example, one created with <code>QByteArray::fromRawData()</code>), 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 <code>QByteArray</code>s to <code>QTextCodec::codecForName()</code> 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."}]}],"references":[{"url":"https://codereview.qt-project.org/c/qt/qt5compat/+/723911","name":"Fix (dev, released in Qt 6.12.0)","tags":["patch"]},{"url":"https://codereview.qt-project.org/c/qt/qt5compat/+/724348","name":"Fix (6.11 branch, released in Qt 6.11.1)","tags":["patch"]},{"url":"https://codereview.qt-project.org/c/qt/qt5compat/+/724995","name":"Fix (6.10 branch)","tags":["patch"]},{"url":"https://codereview.qt-project.org/c/qt/tqtc-qt5compat/+/725112","name":"Fix (6.8 LTS branch, released in Qt 6.8.8)","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N"}}],"solutions":[{"lang":"en","value":"Update to Qt 6.8.8, Qt 6.11.1, Qt 6.12.0, or later, or apply the referenced patch.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Update to Qt 6.8.8, Qt 6.11.1, Qt 6.12.0, or later, or apply the referenced patch.</p>"}]}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-22T18:13:28.519204Z","id":"CVE-2026-9499","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-22T18:28:22.217Z"}}]}}