CVE-2026-115349

The Mistune markdown library, versions 3.0.0 through 3.2.x , is vulnerable to an algorithmic complexity denial of service (DoS) in the parse_link_text function located in src/mistune/helpers.py. An attacker can submit a small, specially crafted markdown request containing deeply nested square bra...

CVE-2026-115349 Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parselinktext function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted...