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CVE-2025-11233

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

MEDIUM
6.3
CVSS Score
Published: October 1, 2025 at 04:49 PM UTC
Updated: October 9, 2026 at 09:10 AM UTC
1 product affected across 1 vendorRust

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rust· Rust Lang
90%
1.87.0 ≤ v < 1.89.01.87.0
Affected range stops below 1.89.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Patch
Source: cverecord
https://github.com/rust-lang/rust/pull/141864
Vendor Advisory
Source: cverecord
https://groups.google.com/g/rustlang-security-announcements/c/oT9zCvLLYkw

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMrust
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22

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