CVE-2025-11233: 
Linux Debian vulnerability analysis and mitigation

CVE-2025-11233 affects the Rust programming language's tier 3 Cygwin target (x86_64-pc-cygwin) from version 1.87.0 and before version 1.89.0. The vulnerability was discovered in the standard library's Path API handling of path separators on Cygwin systems (Rust Security, NVD).

The vulnerability stems from incorrect handling of path separators in the Cygwin target, where the standard library's Path API would ignore path components separated by backslashes. This implementation flaw affects path validation mechanisms, potentially allowing bypass of security checks. The vulnerability has been assigned a CVSS v4.0 base score of 6.3 MEDIUM with vector string CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/AU:Y/RE:L/U:Green (NVD).

The vulnerability could lead to path traversal attacks or malicious filesystem operations by bypassing path validation checks. For example, code that attempts to prevent directory traversal by checking for parent directory components could be circumvented using Win32-style paths (GitHub PR).

The vulnerability has been fixed in Rust 1.89.0 by implementing proper handling of both Win32 and Unix style paths in the standard library for the Cygwin target. Users of affected versions should upgrade to Rust 1.89.0 or later (Rust Security).

The vulnerability was initially reported through Rust's security disclosure process by security researcher RyotaK. Due to the limited scope of impact (affecting only a tier 3 target), the fix was developed and released publicly. The Rust team used this vulnerability to test their CVE publishing process after becoming a CVE Numbering Authority (GitHub PR).