What’s Vulnerable › Vulnerabilities

CVE-2026-56122: Winstone Servlet Engine 0.9.10 Path Traversal via HTTP Request Paths

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-10-25
• Weakness: CWE-22

Description

Winstone Servlet Engine through 0.9.10 contains a path traversal vulnerability that allows unauthenticated attackers to read arbitrary files by sending HTTP GET requests with dot-dot-slash sequences that are not sanitized when serving static files from the configured webroot. Attackers can traverse outside the webroot directory using traversal-prefixed paths in a single HTTP request to read any file accessible to the servlet engine process, including sensitive system files when the service runs with elevated privileges.

Affected products

• rickknowles Winstone Servlet Container: through 0.9.10

References

• https://gist.github.com/VAMorales/ce93f10215c43b2a8344426f4dd59cd3
• https://winstone.sourceforge.net/
• https://www.vulncheck.com/advisories/winstone-servlet-engine-path-traversal-via-http-request-paths

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