Rust standard library didn't detect all path separators on Cygwin

Starting from Rust 1.87.0 and before Rust 1.89.0, the tier 3 Cygwin target (`x86_64-pc-cygwin`) didn't correctly handle path separators, causing the standard library's Path API to ignore path components separated by backslashes. Due to this, programs compiled for Cygwin that validate paths could misbehave, potentially allowing path traversal attacks or malicious filesystem operations. Rust 1.89.0 fixes the issue by handling both Win32 and Unix style paths in the standard library for the Cygwin target. While we assess the severity of this vulnerability as "medium", please note that the tier 3 Cygwin compilation target is only available when building it from source: no pre-built binaries are distributed by the Rust project, and it cannot be installed through Rustup. Unless you manually compiled the `x86_64-pc-cygwin` target you are not affected by this vulnerability. Users of the tier 1 MinGW target (`x86_64-pc-windows-gnu`) are also explicitly not affected.

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对路径名的限制不恰当(路径遍历)

Rust 安全漏洞

Rust是美国Mozilla基金会的一款通用、编译型编程语言。 Rust 1.87.0版本至1.89.0之前版本存在安全漏洞，该漏洞源于路径分隔符处理不当，可能导致路径遍历攻击或恶意文件系统操作。

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