Path Traversal Vulnerability in Winstone Servlet Engine
CVE-2026-56122

8.7HIGH

Key Information:

Vendor

Rickknowles

Status
Winstone Servlet Container
Vendor
CVE Published:
25 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-56122?

Winstone Servlet Engine versions up to 0.9.10 are susceptible to a path traversal vulnerability that enables unauthenticated attackers to access arbitrary files. This occurs when attackers send specially crafted HTTP GET requests that include dot-dot-slash sequences, which are not properly sanitized. By exploiting this flaw, they can traverse beyond the webroot directory and read any files that the servlet engine can access, potentially exposing sensitive data, especially if the server runs with elevated privileges.

Affected Version(s)

Winstone Servlet Container 0 <= 0.9.10

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-56122 - Proof of Concept

References

https://gist.github.com/VAMorales/ce93f10215c43b2a8344426...
technical-descriptionexploit
https://winstone.sourceforge.net/
product
https://www.vulncheck.com/advisories/winstone-servlet-eng...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp.
.