Medium
qt6-5compat, qtbase-opensource-src — security advisory
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.
- Products
- qt6-5compat, qtbase-opensource-src
- Affected versions
- 5.12.4+dfsg-4ubuntu1, 5.12.5+dfsg-2, 5.12.5+dfsg-8, 5.12.5+dfsg-8build1, 5.12.5+dfsg-9build1, 5.12.8+dfsg-0ubuntu1, 5.12.8+dfsg-0ubuntu2.1, 5.12.8+dfsg-0ubuntu2.1+esm1, 5.12.8+dfsg-0ubuntu2.1+esm2, 5.12.8+dfsg-0ubuntu2.1+esm3, 5.12.8+dfsg-0ubuntu2.1+esm4, 5.15.10+dfsg-3, 5.15.10+dfsg-5, 5.15.10+dfsg-5ubuntu1, 5.15.12+dfsg-1ubuntu1, 5.15.12+dfsg-3ubuntu1, 5.15.12+dfsg-3ubuntu6, 5.15.12+dfsg-3ubuntu7, 5.15.13+dfsg-1ubuntu1, 5.15.13+dfsg-1ubuntu1+esm1, 5.15.17+dfsg-1ubuntu1, 5.15.17+dfsg-1ubuntu2, 5.15.18+dfsg-1ubuntu1, 5.15.19+dfsg-2ubuntu1, 5.15.19+dfsg-2ubuntu2, 5.15.2+dfsg-12, 5.15.2+dfsg-13, 5.15.2+dfsg-14, 5.15.2+dfsg-14ubuntu1, 5.15.2+dfsg-14ubuntu3, 5.15.2+dfsg-15, 5.15.3+dfsg-1, 5.15.3+dfsg-2, 5.15.3+dfsg-2ubuntu0.1, 5.15.3+dfsg-2ubuntu0.2, 5.15.3+dfsg-2ubuntu0.2+esm1, 5.15.3+dfsg-2ubuntu0.2+esm2, 5.15.3+dfsg-2ubuntu0.2+esm3, 5.4.2+dfsg-2ubuntu9, 5.5.1+dfsg-10ubuntu2, 5.5.1+dfsg-13ubuntu1, 5.5.1+dfsg-13ubuntu2, 5.5.1+dfsg-13ubuntu3, 5.5.1+dfsg-14ubuntu1, 5.5.1+dfsg-14ubuntu2, 5.5.1+dfsg-14ubuntu3, 5.5.1+dfsg-15ubuntu1, 5.5.1+dfsg-16ubuntu1, 5.5.1+dfsg-16ubuntu6, 5.5.1+dfsg-16ubuntu7, 5.5.1+dfsg-16ubuntu7.1, 5.5.1+dfsg-16ubuntu7.2, 5.5.1+dfsg-16ubuntu7.5, 5.5.1+dfsg-16ubuntu7.6, 5.5.1+dfsg-16ubuntu7.7, 5.5.1+dfsg-16ubuntu7.7+esm1, 5.5.1+dfsg-16ubuntu7.7+esm2, 5.5.1+dfsg-6ubuntu4, 5.9.1+dfsg-10ubuntu1, 5.9.1+dfsg-10ubuntu2, 5.9.2+dfsg-4ubuntu6, 5.9.3+dfsg-0ubuntu1, 5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4, 5.9.4+dfsg-0ubuntu3, 5.9.4+dfsg-0ubuntu4, 5.9.5+dfsg-0ubuntu1, 5.9.5+dfsg-0ubuntu2, 5.9.5+dfsg-0ubuntu2.1, 5.9.5+dfsg-0ubuntu2.3, 5.9.5+dfsg-0ubuntu2.4, 5.9.5+dfsg-0ubuntu2.5, 5.9.5+dfsg-0ubuntu2.6, 5.9.5+dfsg-0ubuntu2.6+esm1, 5.9.5+dfsg-0ubuntu2.6+esm2, 6.10.2-1, 6.10.2-3, 6.10.2-4, 6.11.2-1, 6.2.2-5, 6.2.4-1, 6.4.2-3, 6.4.2-4, 6.4.2-4build1, 6.4.2-4build2, 6.4.2-4build3, 6.9.2-1, 6.9.2-3, 6.9.2-3build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-9499
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:33 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-9499
qtbase-opensource-src
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-5compat
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-5compat
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-5compat
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-5compat
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
Complete source record
{
"id": "fb33330c1873b186eb01fa6902f55e6c106f984a4001cbedf6daf6ea792961b4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-9499",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-9499",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-9499",
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},
{
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},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
"value": "5.15.3+dfsg-2ubuntu0.2+esm2",
"evidence": "/affected/4/versions"
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{
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},
{
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{
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{
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{
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{
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{
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{
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{
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},
{
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{
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]
},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
"value": "5.15.17+dfsg-1ubuntu1",
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},
{
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},
{
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}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-9499",
"aliases": [
"UBUNTU-CVE-2026-9499"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "qtbase-opensource-src",
"purl": "pkg:deb/ubuntu/qtbase-opensource-src?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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"5.5.1+dfsg-6ubuntu4",
"5.5.1+dfsg-10ubuntu2",
"5.5.1+dfsg-13ubuntu1",
"5.5.1+dfsg-13ubuntu2",
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"5.5.1+dfsg-16ubuntu7.7",
"5.5.1+dfsg-16ubuntu7.7+esm1",
"5.5.1+dfsg-16ubuntu7.7+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9499.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
"binary_name": "libqt5opengl5",
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},
{
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},
{
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},
{
"binary_name": "libqt5sql5-mysql",
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},
{
"binary_name": "libqt5sql5-odbc",
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},
{
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},
{
"binary_name": "libqt5sql5-sqlite",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5sql5-tds",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5test5",
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},
{
"binary_name": "libqt5widgets5",
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},
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"modified": "2026-10-17T13:01:19.269887248Z",
"provider": "osv",
"upstream": [
"CVE-2026-9499"
],
"references": [
"https://ubuntu.com/security/CVE-2026-9499",
"https://www.cve.org/CVERecord?id=CVE-2026-9499",
"https://codereview.qt-project.org/c/qt/qt5compat/+/723911",
"https://codereview.qt-project.org/c/qt/qt5compat/+/724348",
"https://codereview.qt-project.org/c/qt/qt5compat/+/724995"
]
},
"related_cves": [
{
"value": "CVE-2026-9499",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361659,
"published_at": "2026-07-21T14:16:00+00:00"
}