CVE-2021-26958: Unchecked Return Value in xcb

August 25, 2021

An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because transmutation to the wrong type can happen after xcb::base::cast_event uses std::mem::transmute to return a reference to an arbitrary type.

References

github.com/RustSec/advisory-db/issues/653
github.com/advisories/GHSA-3cj3-jrrp-9rxf
github.com/rtbo/rust-xcb
nvd.nist.gov/vuln/detail/CVE-2021-26958
rustsec.org/advisories/RUSTSEC-2021-0019.html

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