c.f. https://rustsec.org/advisories/RUSTSEC-2024-0375.html
FEDORA-2025-8b79fa8396 (rust-cursive0.20-0.20.0-1.fc43, rust-cursive-0.21.1-1.fc43, and 4 more) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2025-8b79fa8396
FEDORA-2025-8b79fa8396 (rust-cursive0.20-0.20.0-1.fc43, rust-cursive-0.21.1-1.fc43, and 4 more) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report.