Unauthenticated file access via noncanonical path validation
Published May 5, 2026 · Updated May 5, 2026
Path traversal in Code-MCP through commit 4cfc4643541a110c906d93635b391bf7e357f4a8 allows remote attackers to read and write files outside the project root. The is_safe_path helper tests Path.absolute() parent membership without canonicalizing traversal segments before file operations. An attacker must be able to invoke MCP file tools, and access remains limited by the server account's filesystem permissions; exploitation enables out-of-workspace reads, writes, edits, or deletion.
Summary
What happened
Path traversal in Code-MCP through commit 4cfc4643541a110c906d93635b391bf7e357f4a8 allows remote attackers to read and write files outside the project root. The is_safe_path helper tests Path.absolute() parent membership without canonicalizing traversal segments before file operations. An attacker must be able to invoke MCP file tools, and access remains limited by the server account's filesystem permissions; exploitation enables out-of-workspace reads, writes, edits, or deletion.
The record
- CVE
- CVE-2026-7811
- Published
- May 5, 2026
- Updated
- May 5, 2026
- Vendor
- Yiyang (Steven) Yu
- Product
- Code-MCP
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 5, 2026CVE publishedPublication date reported by the CVE source.
- May 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=4cfc4643541a110c906d93635b391bf7e357f4a8
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- Workspace Traversal via Path Validation Bypass reproductionproof of concept · unverified
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Technologies
Your stack
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Your stack
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