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  4. CVE 2026 54916 netbox device type library module shadowing
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Back to active CVEs
High · CVSS 8.8CVE-2026-54916

NetBox Device Type Library: Module Shadowing Bypass of prior pickle fix - RCE via missing `tests/__init__.py` + SSRF via unfixed `NETBOX_DT_LIBRARY_URL` → Cloud Metadata credential theftCVE-2026-54916

Answer in brief

CVE-2026-54916 records a High severity (CVSS 8.8) vulnerability in NetBox Device Type Library: Module Shadowing Bypass of prior pickle fix - RCE via missing `tests/__init__.py` + SSRF via unfixed `NETBOX_DT_LIBRARY_URL` → Cloud Metadata credential theft. The current sources do not mark it as known exploited. The current feed maps netbox-community/devicetype-library (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 24, 2026Source checked Nov 2, 2026First seen by HOL Sep 17, 2026Material review Sep 24, 2026
Upstream Advisory

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-427, CWE-829
Source
CVE List V5
Source checked
Nov 2, 2026
References
3 linked sources
Open source record

Key facts

Risk
High · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps netbox-community/devicetype-library (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
netbox-community/devicetype-librarygeneric<b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037gb0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037g

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for netbox-community/devicetype-library.
  2. 2Review the reported fix. Update netbox-community/devicetype-library to b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037g if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 17, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

NetBox Device Type Library is a collection of community-sourced device type definitions for import into NetBox. The absence of tests/init.py and the lack of --import-mode=importlib cause pytest prepend import mode to place the tests directory at the front of sys.path during collection. An unauthenticated contributor can add a module such as tests/git.py that shadows GitPython when tests/definitions_test.py executes from git import Git, Repo, or add tests/conftest.py for automatic collection-time execution. Python imports and runs the pull-request module before any test function, allowing arbitrary code execution on the GitHub Actions runner, test-result tampering, and access to tokens or network resources exposed to the workflow. This module-shadowing path is independent of the earlier pickle deserialization flaw and the separately tracked NETBOX_DT_LIBRARY_URL issue. This vulnerability is fixed by commit b0d9a3dadd0a0a9d3c93b0b2777559fd4bad1037.

Quoted source text, attributed separately from HOL analysis.