Unauthenticated file read via backslash path traversal
Published Feb 19, 2026 · Updated Feb 19, 2026
Path traversal in LabStack Echo 5.0.0 through 5.0.2 on Windows allows remote attackers to read files via encoded backslashes. middleware.Static applies URL-style path cleaning, which leaves backslash traversal sequences intact before defaultFS passes the path to os.Open. Exploitation requires both default filesystem settings and exposes local files readable by the Echo process without authentication or user interaction.
Summary
What happened
Path traversal in LabStack Echo 5.0.0 through 5.0.2 on Windows allows remote attackers to read files via encoded backslashes. middleware.Static applies URL-style path cleaning, which leaves backslash traversal sequences intact before defaultFS passes the path to os.Open. Exploitation requires both default filesystem settings and exposes local files readable by the Echo process without authentication or user interaction.
The record
- CVE
- CVE-2026-25766
- Published
- Feb 19, 2026
- Updated
- Feb 19, 2026
- Vendor
- LabStack
- Product
- Echo
- Classifications
- CWE-22, T1190, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 19, 2026CVE publishedPublication date reported by the CVE source.
- Feb 19, 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=>= 5.0.0, < 5.0.3
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
- GHSA-pgvm-wxw2-hrv9 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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