synced 1 MIN AGO
01 Record

CVE-2026-9499

Out-of-bounds read in QTextCodec::codecForName() in Qt

MediumPUBLISHEDCNA: TQtC
CNA base score6.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
View raw JSON

02 Description

Out-of-bounds read in QTextCodec::codecForName() in Qt

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.30% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 22.6% of scored records. A rank, not a probability.
NVD base score
6.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Deferred. NVD last modified this record on 2026-07-23.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-07-21 13:25Z3 MO AGO
Last updated
2026-07-22 18:28Z3 MO AGO
Reserved
2026-05-25
Assigning CNA
TQtC
Record state
PUBLISHED
Severity
Medium (CVSS 6.3)
CNA CVSS vector
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
Weaknesses
Data version
5.2
Document digest
8eed206862825749ed7b842945878b79f044973e65124a9d3f8c2c2b108d4994

05 Affected products

VendorProductVersionsPlatforms
QtQt6.0.0 to < 6.8.8, 6.9.0 to < 6.11.1, 4.0.0 to < 6.0.0—

06 References

07 Remediation

Update to Qt 6.8.8, Qt 6.11.1, Qt 6.12.0, or later, or apply the referenced patch.

08 Fixed in

AlmaLinux 8

  • qt5-qtbase
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-common
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-devel
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-examples
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-gui
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-mysql
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-odbc
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-postgresql
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-private-devel
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-static
    Fixed in 5.15.3-9.el8_10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • qt5-qtbase
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-common
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-devel
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-examples
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-gui
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-mysql
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-odbc
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-postgresql
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-private-devel
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-static
    Fixed in 5.15.9-11.el9_8.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • qt6-qt5compat
    Fixed in 6.10.1-1.el10_2.1
  • qt6-qt5compat-devel
    Fixed in 6.10.1-1.el10_2.1
  • qt6-qt5compat-examples
    Fixed in 6.10.1-1.el10_2.1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • qt5-qtbase
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-common
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-devel
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-examples
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-gui
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-mysql
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-odbc
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-postgresql
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-private-devel
    Fixed in 5.15.3-9.el8_10
  • qt5-qtbase-static
    Fixed in 5.15.3-9.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • qt5-qtbase
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-common
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-devel
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-examples
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-gui
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-mysql
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-odbc
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-postgresql
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-private-devel
    Fixed in 5.15.9-11.el9_8.1
  • qt5-qtbase-static
    Fixed in 5.15.9-11.el9_8.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • qt6-qt5compat
    Fixed in 6.10.1-1.el10_2.1
  • qt6-qt5compat-devel
    Fixed in 6.10.1-1.el10_2.1
  • qt6-qt5compat-examples
    Fixed in 6.10.1-1.el10_2.1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • qt6-5compat
    No fix yet
  • qtbase-opensource-src
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • qt6-5compat
    No fix yet
  • qtbase-opensource-src
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • qt6-5compat
    Fixed in 6.10.2-4
  • qtbase-opensource-src
    Fixed in 5.15.19+dfsg-4

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • qt6-5compat
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • qt6-5compat
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • qt6-5compat
    No fix yet
  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.10

  • qt6-5compat
    No fix yet
  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 24.04 LTS

  • qtbase-opensource-src
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.