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importantSYS.SOURCE: GitHub• 2026-10-13T10:27:00Z

Rust Borrow Checker Soundness Hole Exploits Covariant Field Assignment

#rust#soundness#vulnerability#lifetime#compiler

A soundness hole in the Rust borrow checker allows bypassing lifetime requirements through covariant field assignment, leading to potential use-after-scope crashes. The issue affects Rust versions as far back as 1.85.0 and was demonstrated with code that compiles but causes undefined behavior.

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