Bug 2543059 (CVE-2026-95509)

Summary: CVE-2026-95509 qt: Qt for MCUs: Denial of service via out-of-bounds read in string formatting
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Qt for MCUs. An incorrect buffer size calculation occurs during String.arg() formatting when handling Latin-1 encoded characters, leading to an out-of-bounds read. A remote attacker could supply specially crafted string input to trigger this flaw, resulting in an application crash leading to a Denial of Service (DoS) or limited information disclosure.
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Description OSIDB Bzimport 2026-09-29 10:52:51 UTC 
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.