CVE-2026-104454 [MEDIUM] – YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php

YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php formatter due to an O(n^2) markdown-link regex. Unauthenticated attackers can submit a small crafted body of bracket characters to the page-edit preview endpoint to pin PHP-FPM workers and saturate the pool.