November 14, 2026

CVE Watchtower

CVE-2026-107590qt Qt Out-of-bounds Write

NVD

Vulnerability Summary

An out-of-bounds write vulnerability in the Qt QTextCodec iconv-based encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier) impacts Qt. Under certain conditions, encoding text with QTextCodec may write outside an internal buffer. This can cause the application to crash and may affect data integrity.
Severity Level
LOW(1.9)
Published Date
Oct 27, 2026
Last Modified
Nov 4, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.12%Probability
Root Weakness (CWE)
CWE-787: Out-of-bounds Write ↗
The product writes data past the end, or before the beginning, of the intended buffer.
CWE-131 ↗
See the MITRE CWE entry for the full definition of this weakness.
CVSS v4.0 Base Metrics — Score 1.9 (LOW)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/R:U/RE:L/U:Green
Attack VectorLocal
Attack ComplexityLow
Attack RequirementsPresent
Privileges RequiredNone
User InteractionPassive
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)Low
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions
  • qt Qt >= 4.5.0 and <= 6.8.8
  • qt Qt >= 6.9.0 and <= 6.11.2
Patched Versions
  • qt Qt 6.8.8
  • qt Qt 6.11.2

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

  • Oct 27, 2026Published
  • Nov 4, 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