What’s New in Rust 1.94.1? Key Fixes and Upgrade Guide
Rust 1.94.1, released at the end of March 2026, fixes three regressions, removes an unstable Windows API, updates Cargo dependencies, adds security patches for CVE‑2026‑33055/33056, and can be upgraded via a simple rustup command or the official installer page.
Rust 1.94.1 was released at the end of March 2026, introducing several bug fixes, regressions resolutions, and security updates.
Upgrade Instructions
If Rust was previously installed with rustup, upgrade the stable toolchain by running: rustup update stable New installations can be performed from the official download page:
https://www.rust-lang.org/install.html
Key Changes in 1.94.1
Regression fixes introduced in 1.94.0:
Corrected std::thread::spawn behavior on the wasm32-wasip1-threads target.
Removed the unstable method std::os::windows::fs::OpenOptionsExt, which was previously added but never stabilized.
Clippy improvements:
Fixed an internal compiler error (ICE) triggered by the match_same_arms lint.
Cargo dependency adjustments:
Downgraded curl-sys to version 0.4.83, addressing certificate verification failures observed on certain FreeBSD releases.
Security Fixes
Cargo updated the tar crate to version 0.4.45, which patches CVE‑2026‑33055 and CVE‑2026‑33056. These vulnerabilities affect only the Cargo implementation; crates.io users are not impacted.
Repository Links
Rust source code and release information are hosted at:
https://github.com/rust-lang
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