Arbitrary file write via SFTP filename traversal
Published Aug 10, 2026 · Updated Aug 10, 2026
Path traversal in Tabby before 1.0.235 allows remote attackers controlling an SFTP server to write files outside the chosen directory on Windows. POSIX filename handling preserves backslash parent-directory components from entry.name until Windows path.join() treats them as separators at the local file sink. Exploitation requires a user to download an SFTP directory or choose Edit locally; attacker-controlled content can create or overwrite user-writable files outside the intended root.
Summary
What happened
Path traversal in Tabby before 1.0.235 allows remote attackers controlling an SFTP server to write files outside the chosen directory on Windows. POSIX filename handling preserves backslash parent-directory components from entry.name until Windows path.join() treats them as separators at the local file sink. Exploitation requires a user to download an SFTP directory or choose Edit locally; attacker-controlled content can create or overwrite user-writable files outside the intended root.
The record
- CVE
- CVE-2026-72903
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- Russh Project
- Product
- Tabby
- Classifications
- CWE-22, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.0.235
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Upstream Windows SFTP traversal proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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