Medium (5.1) in servo idna. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in idna 1.0.0.
Improper Validation of Unsafe Equivalence in punycode by the idna crate from Servo rust-url allows an attacker to create a punycode hostname that one part of a system might treat as distinct while another part of that system would treat as equivalent to another hostname.