hb-ot-layout-gsubgpos.hh in HarfBuzz through 6.0.0 allows attackers to trigger O(n^2) growth via consecutive ma rks during the process of looking back for base glyphs when attaching marks. CREATE(Triage):(User=admin) CVE-2023-25193 (https://nvd.nist.gov/vuln/detail/CVE-2023-25193)