OSV-2026-760 Heap-buffer-overflow in md_decode_utf8__

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=513677122 Crash type: Heap-buffer-overflow READ 1 Crash state: mddecodeutf8 mdskipunicodewhitespace mdlinklabelhash...