hb-ot-layout-gsubgpos.hh in HarfBuzz through 6.0.0 allows attackers to trigger O(n^2) growth via consecutive marks during the process of looking back for base glyphs when attaching marks.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-25193.json"