GHSA-3q6v-r5mr-hxv8: league/commonmark: Quadratic-time denial of service in the GitHub Flavored Markdown Table extension

league/commonmark's GitHub Flavored Markdown Table extension registers TableStartParser as a block-start parser. While a paragraph is the active block, the core block parser calls TableStartParser::tryStart() on every non-blank line. Its first action fetches the entire growing paragraph buffer via getParagraphContent() and runs strpos($paragraph, '|') across all of it. For a paragraph of M pipe-free lines, line k rescans about k lines of buffer, so total work is 1+2+...+M, which is O(M^2). …