Path Traversal in Rickknowles Winstone Servlet Container
CVE-2026-56122
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (44.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Rickknowles Winstone Servlet Container — versions 0
Weakness classification (CWE)
References
- gist.github.com/VAMorales/ce93f10215c43b2a8344426f4dd59cd3 (technical-description, exploit)
- winstone.sourceforge.net/ (product)
- www.vulncheck.com/advisories/winstone-servlet-engine-path-traversal-via-http-re… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56122?
- CVE-2026-56122 is a high-severity vulnerability in Rickknowles Winstone Servlet Container, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-06-25.
- How severe is CVE-2026-56122?
- High severity. CVSS v3 base score is 7.5 out of 10.