November 14, 2026

CVE Watchtower

CVE-2026-103645qt qt Integer Overflow or Wraparound

NVD

Vulnerability Summary

An integer overflow vulnerability in the Qt QTextCodec fromUnicode() and toUnicode() functionality of the Qt 5 Core Compatibility APIs module (Qt 6) and the Qt Core module (Qt 5). Only builds where Qt is compiled with ICU support are affected.
Severity Level
LOW(1.1)
Published Date
Nov 13, 2026
Last Modified
Nov 13, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.17%Probability
Root Weakness (CWE)
CWE-190: Integer Overflow or Wraparound β†—
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes the resulting value will always be larger than the original.
CWE-835: Loop with Unreachable Exit Condition (Infinite Loop) β†—
The product contains an iteration or loop with an exit condition that cannot be reached.
CVSS v4.0 Base Metrics — Score 1.1 (LOW)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/R:U/U:Clear
Attack VectorLocal
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionPassive
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)None
Availability (Vulnerable System)Low
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions
  • qt qt < 5.0.0
  • qt qt >= 5.0.0 and < 6.8.9
  • qt qt >= 6.9.0 and < 6.11.3
Patched Versions
  • qt qt 5.0.0
  • qt qt 6.8.9
  • qt qt 6.11.3

What to do

Fix it during your normal patch cycle. No exploitation is confirmed yet.

  1. Check whether you run qt qt and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Nov 13, 2026Published
  • Nov 13, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 14, 2026 01:09 UTC