CVE-2026-25541

CVE-2026-25541 affects the Bytes Rust crate for versions 1.2.1 through 1.11.0. The issue is an integer overflow in BytesMut::reserve during the unique reclaim path, where an unchecked addition can make v_capacity >= new_cap + offset pass in release builds, causing self.cap to exceed allocated ...

Integer overflow in `BytesMut::reserve`

In the unique reclaim path of BytesMut::reserve, the condition rs if vcapacity = newcap + offset uses an unchecked addition. When newcap + offset overflows usize in release builds, this condition may incorrectly pass, causing self.cap to be set to a value that exceeds the actual allocated capacit...