CVE-2025-11233Network attack vector

Path traversal via ignored backslash separators

Published Oct 1, 2025 · Updated Oct 1, 2025

Path traversal in Rust Standard Library 1.87.0 through 1.88.0 allows attackers to bypass path validation in Cygwin programs. On the x86_64-pc-cygwin target, the Path API treated backslashes as ordinary path content rather than separators, so component-based checks omitted attacker-controlled segments. Only programs built from source for tier 3 Cygwin and using Path-based validation are exposed; MinGW builds are unaffected, and filesystem consequences depend on each program's later use of the original path.

CVSS severity6.3
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Rust Standard Library 1.87.0 through 1.88.0 allows attackers to bypass path validation in Cygwin programs. On the x86_64-pc-cygwin target, the Path API treated backslashes as ordinary path content rather than separators, so component-based checks omitted attacker-controlled segments. Only programs built from source for tier 3 Cygwin and using Path-based validation are exposed; MinGW builds are unaffected, and filesystem consequences depend on each program's later use of the original path.

The record

CVE
CVE-2025-11233
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
Rust Project
Product
Rust Standard Library
Classifications
CWE-22, CAPEC-126
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.87.0 <1.89.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rust Project · Rust Standard Libraryversion=1.87.0 <1.89.0

Published CVSS scores

6.3Rust ProjectCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-126Path Traversal

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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