CVE-2026-56122 Winstone Servlet Engine 0.9.10 Path Traversal via HTTP Request Paths
Unauthenticated attackers can read arbitrary files outside the webroot via path traversal in Winstone Servlet Engine HTTP requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56122?
CVE-2026-56122 is a high-severity path traversal vulnerability in rickknowles Winstone Servlet Container, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-56122?
How do I fix CVE-2026-56122?
No fix has been published for CVE-2026-56122 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-56122 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56122 exists.
Sources
Also known as GHSA-qf2j-8858-jvcv.