Qt Group PlcCVE-2026-95509

Qt for MCUs: out-of-bounds read

High8.8CVE-2026-95509 · Published Sep 29, 2026 · updated Sep 30, 2026

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.

Qt Group Plc advisory

Affected versions

Package	Affected	Fixed in
Qt for MCUs Product	>= 2.6.0, < 2.11.3	2.11.3
	>= 2.12.0, < 2.12.3	2.12.3

Details and references

CVSS 4.0: 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/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
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-125, CWE-131

More Qt Group Plc advisories

All Qt Group Plc

Date	Advisory	Severity	Fixed in
Sep 24	qt: authentication bypass Medium4.5Sep 24 CVE-2026-796806.8.9+1 more	Medium4.5	6.8.9+1 more
Sep 23	qt: denial of service Low2.3Sep 23 CVE-2026-78253No fix yet	Low2.3	No fix yet
Sep 23	qt: out-of-bounds read Low0.6Sep 23 CVE-2026-79616No fix yet	Low0.6	No fix yet
Sep 16	qt: out-of-bounds read Medium4.6Sep 16 CVE-2026-761516.8.9+1 more	Medium4.6	6.8.9+1 more
Sep 16	qt: denial of service High7.1Sep 16 CVE-2026-19248No fix yet	High7.1	No fix yet
Sep 11	qt: out-of-bounds read Medium6.9Sep 11 CVE-2026-133266.8.9+1 more	Medium6.9	6.8.9+1 more

Affected versions

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