CVE-2025-11233

Name	CVE-2025-11233
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rustc (PTS)	bullseye	1.48.0+dfsg1-2	fixed
	bookworm	1.63.0+dfsg1-2	fixed
	trixie	1.85.0+dfsg3-1	fixed
	forky, sid	1.90.0+dfsg1-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
rustc	source	bullseye	(not affected)
rustc	source	bookworm	(not affected)
rustc	source	trixie	(not affected)
rustc	source	(unstable)	1.89.0+dfsg1-1

Notes

[trixie] - rustc <not-affected> (Introduced in 1.87)
[bookworm] - rustc <not-affected> (Introduced in 1.87)
[bullseye] - rustc <not-affected> (Introduced in 1.87)
https://groups.google.com/g/rustlang-security-announcements/c/oT9zCvLLYkw