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Vulnerability record · CVE-2026-56122 · published 25 June 2026

CVE-2026-56122: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.55% · top 56.0% CWE-22 · Path traversal Deferred
8.7CVSS 4.0 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
25 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-56122), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.