encodeText in QDom in Qt before 6.8.0 has a complex algorithm involving XML string copy and inline replacement of parts of a string (with relocation of later data).
Exploitability
AV:NAC:LPR:NUI:NScope
S:CImpact
C:NI:NA:L5.8/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:LOther