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CVE-2026-9499 (GCVE-0-2026-9499)

Vulnerability from cvelistv5 – Published: 2026-07-21 13:25 – Updated: 2026-07-22 18:28
VLAI
Title
Out-of-bounds read in QTextCodec::codecForName() in Qt
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.
Severity
6.3 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 18:13 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Qt Qt Affected: 6.0.0 , < 6.8.8 (python)
Affected: 6.9.0 , < 6.11.1 (python)
    cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
Create a notification for this product.
Qt Qt Affected: 4.0.0 , < 6.0.0 (python)
    cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
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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\", \"value\": \"An out-of-bounds read (buffer over-read) vulnerability exists in \u003ccode\u003eQTextCodec::codecForName()\u003c/code\u003e in Qt. When the function is called with a \u003ccode\u003eQByteArray\u003c/code\u003e that is not NUL-terminated (for example, one created with \u003ccode\u003eQByteArray::fromRawData()\u003c/code\u003e), 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\u0027s fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated \u003ccode\u003eQByteArray\u003c/code\u003es to \u003ccode\u003eQTextCodec::codecForName()\u003c/code\u003e 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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"6.0.0\"}, {\"criteria\": \"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.1\", \"versionStartIncluding\": \"6.9.0\"}], \"operator\": \"OR\"}, {\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.0\", \"versionStartIncluding\": \"4.0.0\"}], \"operator\": \"OR\"}], \"operator\": \"OR\"}], \"providerMetadata\": {\"orgId\": \"a59d8014-47c4-4630-ab43-e1b13cbe58e3\", \"shortName\": \"TQtC\", \"dateUpdated\": \"2026-07-21T13:25:27.477Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-9499\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-22T18:28:22.217Z\", \"dateReserved\": \"2026-05-25T09:55:56.600Z\", \"assignerOrgId\": \"a59d8014-47c4-4630-ab43-e1b13cbe58e3\", \"datePublished\": \"2026-07-21T13:25:27.477Z\", \"assignerShortName\": \"TQtC\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.