CVE-2020-15254

Crossbeam is a set of tools for concurrent programming. In crossbeam-channel before version 0.4.4, the bounded channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes described above. This is unsound and causing deallocation with the incorrect capacity when `Vec::from_iter` has allocated different sizes with the number of iterator elements. This has been fixed in crossbeam-channel 0.4.4.

• CWE-119
• CWE-401

• https://github.com/RustSec/advisory-db/pull/425Patch, Third Party Advisory
• https://github.com/crossbeam-rs/crossbeam/issues/539Exploit, Third Party Advisory
• https://github.com/crossbeam-rs/crossbeam/pull/533Exploit, Patch, Third Party Advisory
• https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv-f3hxThird Party Advisory
• https://github.com/RustSec/advisory-db/pull/425Patch, Third Party Advisory
• https://github.com/crossbeam-rs/crossbeam/issues/539Exploit, Third Party Advisory
• https://github.com/crossbeam-rs/crossbeam/pull/533Exploit, Patch, Third Party Advisory
• https://github.com/crossbeam-rs/crossbeam/security/advisories/GHSA-v5m7-53cv-f3hxThird Party Advisory

Published

Oct 16, 2020

Last Modified

Jun 17, 2026

Status

Modified

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