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Vulnerability · Published Oct 15, 2026 · Assigned by GitHub_M

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

Critical 9.6

In plain English

A critical-severity path traversal in NetLicensing-MCP from Labs64. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)0.4%top 62.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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, netlicensing_get_product passes the caller-controlled product_number to src/netlicensing_mcp/tools/products.py, which interpolates it into a REST path consumed by nl_get() in src/netlicensing_mcp/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 _wrap_json instead of _wrap_json_token_read, bypassing redact_token_read() 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPInetlicensing-mcp0.1.8GHSA-hxpf-9xvq-wph8
PyPInetlicensing-mcp0.1.8PYSEC-2026-3489

Affected products (as reported)

VendorProductVersions
Labs64 NetLicensing-MCP < 0.1.8

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

References