High severity · published Sep 29, 2026
CVE-2026-95509
Out-of-bounds read vulnerability in string formatting impacts Qt for MCUs
8.8
CVSS
0.3%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QF
Qt for MCUs · qt
2.6.0 before 2.11.3; 2.12.0 before 2.12.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-95509
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-95509
issue-tracking
https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95509:
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