CVE-2025-11233
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
In Rust from 1.87.0 to before 1.89.0, the tier 3 Cygwin target (x86_64-pc-cygwin) mishandled path separators, causing the standard library's Path API to ignore path components separated by backslashes. Programs compiled for Cygwin that validate paths could misbehave, potentially allowing path traversal attacks or malicious filesystem operations. Rust 1.89.0 fixes this.
Risk Assessment
Organizations using Rust to compile for Cygwin may be exposed to path traversal attacks, potentially leading to unauthorized file access or modification. However, the Cygwin target is only available when building from source, so risk only applies to those who manually compiled this target.
Recommendation
Update Rust to 1.89.0 or later if you use the Cygwin target. Also verify whether you use this target; if not, you are not affected.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

