CVE-2026-57496: NetLicensing MCP Server: REST Path Traversal Bypasses Token Redaction

NetLicensing MCP Server is a natural-language interface that enables agentic applications to manage the software-licensing lifecycle in Labs64 NetLicensing. Prior to 0.1.8, netlicensinggetproduct passes the caller-controlled productnumber to src/netlicensingmcp/tools/products.py, which interpolates it into a REST path consumed by nlget() in src/netlicensingmcp/client.py without path-segment validation. A traversal segment can be normalized from the intended product path to the /token endpoint, after which the response is serialized through wrapjson instead of wrapjsontokenread, bypassing redacttokenread() protections for APIKEY number and SHOP shopURL fields. An authenticated MCP client with a non-administrative API key can retrieve plaintext token values, and a recovered administrative token can provide broad read, write, and delete access to the NetLicensing account. This issue is fixed in version 0.1.8.