CVE-2023-51714 An issue was discovered in the HTTP2 implementation in Qt before 5.15.17 6.x before 6.2.11 6.3.x through 6.5.x before 6.5.4 and 6.6.x before 6.6.2. network/access/http2/hpacktable.cpp has an incorrect HPack integer overflow check.

Api.Msrc.Microsoft • February 18, 2026

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Multiple CVEs Identified in Qt HTTP2 Implementation Two vulnerabilities have been discovered in the HTTP2 implementation of Qt affecting multiple versions. CVE-2023-51714, published on December 24, 2023, involves an HPack integer overflow check issue, while CVE-2024-39936, published on July 4, 2024, relates to premature execution of security decisions due to signal processing delays. Both vulnerabilities could impact applications relying on affected Qt versions. 2 sources 39

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