CVE-2026-95509

Out-of-bounds read vulnerability in string formatting impacts Qt for MCUs

State: Published
Severity: 8.8 High
Published: Sep 29, 2026
Updated: Sep 29, 2026
Reserved: Sep 22, 2026

Description

Strings optimized for Latin-1 displaying Latin-1 characters cause incorrect String.arg() formatting by an incorrect buffer size calculation, causing out-of-bounds reading.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N	Qt

Weaknesses

CWE-125 Out-of-bounds Read
CWE-131 Incorrect Calculation of Buffer Size

Affected Products

Product	Versions
Qt for MCUsqt	2.6.0 to before 2.11.3Affected 2.12.0 to before 2.12.3Affected

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95509:issue-tracking

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