An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because there is an out-of-bounds read in xcb::xproto::change_property(), as demonstrated by a format=32 T=u8 situation where out-of-bounds bytes are sent to an X server.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-26957
• rustsec/advisory-db#653
• https://rustsec.org/advisories/RUSTSEC-2021-0019.html