CVE-2021-28878: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

In the standard library in Rust before 1.52.0, the Zip implementation calls __iterator_get_unchecked() more than once for the same index (under certain conditions) when next_back() and next() are used together. This bug could lead to a memory safety violation due to an unmet safety requirement for the TrustedRandomAccess trait.

Affected products

• Fedoraproject Fedora: version 32 only; version 33 only; version 34 only
• Rust-Lang Rust: before 1.52.0 (fixed in 1.52.0)

Published 2021-04-11. Last modified 2026-06-17.