netlicensing-mcp: REST Path Traversal Bypasses Token Redaction

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.6 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS

• CVE-2026-57496: 0.43% estimated exploitation activity in the next 30 days; percentile 37.86 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The netlicensinggetproduct MCP tool in netlicensing-mcp interpolates a caller-controlled productnumber argument directly into a REST URL path without any validation. Passing ../token as the product number causes httpx to normalize /product/../token into /token, silently redirecting the request to the NetLicensing token endpoint instead of the intended product endpoint. The response is then serialized through the generic wrapjson wrapper rather than the token-specific wrapjsontokenread wrapper, bypassing all APIKEY number and SHOP shopURL redaction. An authenticated MCP client can recover plaintext API key values that the token read tools intentionally mask, including admin-level APIKEY credentials. Details The vulnerability is a path traversal (CWE-22) that exploits the interaction between unsanitized string interpolation and httpx's WHATWG URL normalization. Source — src/netlicensingmcp/tools/products.py:22 productnumber is inserted directly into the REST path with no…

Published by the source

18 Jun 2026, 17:22 UTC

Last modified by the source

15 Oct 2026, 18:45 UTC

Source last checked

26 Oct 2026, 13:55 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-hxpf-9xvq-wph8

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-hxpf-9xvq-wph8

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-hxpf-9xvq-wph8

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# Patch Next advisory brief: CVE-2026-57496

Advisory: netlicensing-mcp: REST Path Traversal Bypasses Token Redaction
IDs: CVE-2026-57496, GHSA-hxpf-9xvq-wph8
Record: https://patchnext.com/advisories/cve-2026-57496 (revision 3, source checked 26 Oct 2026, 13:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: netlicensing-mcp 0.1.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI netlicensing-mcp: affected < 0.1.8; fixed in 0.1.8

## Suggested inspection (read-only)
- `python -m pip show netlicensing-mcp`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on netlicensing-mcp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hxpf-9xvq-wph8 (GitHub-reviewed advisory GHSA-hxpf-9xvq-wph8 lists affected ranges: PyPI netlicensing-mcp >=0 <0.1.8)
- Verified: https://osv.dev/vulnerability/GHSA-hxpf-9xvq-wph8 (OSV record GHSA-hxpf-9xvq-wph8 lists affected ranges: PyPI netlicensing-mcp >=0 <0.1.8 (fixed))

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