🛡️ RUSTSEC-2026-0197 — cgmath

Matrix{2,3,4}::swap_columns can trigger undefined behavior for identical indices

The Matrix2::swap_columns, Matrix3::swap_columns, and Matrix4::swap_columns

implementations call ptr::swap(&mut self[a], &mut self[b]).

When a == b, these safe APIs create two mutable references to the same matrix

column and pass them to ptr::swap. This violates Rust's aliasing rules and can

trigger undefined behavior. The issue can be reproduced from safe Rust by calling

swap_columns with identical column indices, for example m.swap_columns(0, 0).

A minimal fix is to return early when the two column indices are equal before

calling ptr::swap.