HarfBuzz is an OpenType text shaping engine.
Multiple vulnerabilities have been discovered in HarfBuzz. Please review the CVE identifiers referenced below for details.
hb-ot-layout-gsubgpos.hh in HarfBuzz allows attackers to trigger O(n^2) growth via consecutive marks during the process of looking back for base glyphs when attaching marks.
There is no known workaround at this time.
All HarfBuzz users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/harfbuzz-7.1.0"