CVE-2026-55251 Code injection in devicetype-library
Attackers can execute arbitrary code on CI runners by submitting malicious configuration files in pull requests to the NetBox Device Type Library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55251?
CVE-2026-55251 is a medium-severity code injection vulnerability in netbox-community devicetype-library, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NetBox Device Type Library is a collection of community-sourced device type definitions for import into NetBox. Prior to commit f41fc1e, the CI workflow .github/workflows/validation.yml runs on pull_request and executes code supplied by the pull request before any maintainer review. Three PR-editable files drive this: "requirements.txt", ".pre-commit-hooks-config.yaml" / ".pre-commit-yamlfmt-config.yaml", and ".gitmodules". A contributor with no special repository access could open a pull request that modifies these files and have their code run on the CI runner. This issue has been patched via commit f41fc1e.
Which versions are affected by CVE-2026-55251?
How do I fix CVE-2026-55251?
No fix has been published for CVE-2026-55251 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-55251 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55251 exists.
Sources
Also known as GHSA-5x2m-x42f-g4cm.