I casually thumbed through a few of the commits they posted and came across this https://chromium.googlesource.com/chromium/src/+/c368e30ae55600a1c3c9cb1710a54

I casually thumbed through a few of the commits they posted and came across this https://chromium.googlesource.com/chromium/src/+/c368e30ae55600a1c3c9cb1710a54f9c55de786e%5E%21/#F48 https://chromium.googlesource.com/chromium/src/+/c368e30ae55... for(i=0; i<nChar; i++){ if( n>=nByte ) return 0; /* Input contains fewer than nChar chars */ if( (unsigned char)p[n++]>=0xc0 ){ - while( (p[n] & 0xc0)==0x80 ) n++; + while( (p[n] & 0xc0)==0x80 ){ + n++; + if( n>=nByte ) break; + } } } return n; Looks like there may have been an issue in parsing malformed multibyte unicode characters properly.