Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments

Exploitation

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

CVSS 4.0

7.0 · CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2026-52817: 0.18% estimated exploitation activity in the next 30 days; percentile 7.59 (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 In the Debian.sudoers file, apt-get is allowed for the nagios user. The full command including the arguments are not enforced and can therefore be choosen arbitrarily. This allows to easily get a root shell as the nagios user: PoC By choosing a particular argument, you can get (as a nagios user) a root shell: Since the nagious user can use sudo to run apt-get as root, the resulting shell is also running as root. Impact The vulnerability is a local privilege escalation, impacting users who use the provided sudoers file. It requires that an attacker already compromised the nagios account (which is quite a high barrier to be honest). Fix Since only one place where apt-get is currently used (in deb-updates) was found, it should be enough to allow only the specific arguments used there. Here an example how the line in the sudoers file could look like:

Published by the source

2 Jul 2026, 20:23 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:46 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-8w6w-23mq-h8rg

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-8w6w-23mq-h8rg

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# Patch Next advisory brief: CVE-2026-52817

Advisory: Linuxfabrik Monitoring Plugins: Sudoers may be able to obtain privilege escalation via /usr/bin/apt-get arguments
IDs: CVE-2026-52817, GHSA-8w6w-23mq-h8rg
Record: https://patchnext.com/advisories/cve-2026-52817 (revision 3, source checked 26 Oct 2026, 13:46 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: linuxfabrik-lib 5.1.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI linuxfabrik-lib: affected <= 5.0.0; fixed in 5.1.0

## Suggested inspection (read-only)
- `python -m pip show linuxfabrik-lib`: 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 linuxfabrik-lib.
- 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://osv.dev/vulnerability/GHSA-8w6w-23mq-h8rg (OSV record GHSA-8w6w-23mq-h8rg lists affected ranges: PyPI linuxfabrik-lib >=0 <5.1.0 (fixed))
- Verified: https://github.com/advisories/GHSA-8w6w-23mq-h8rg (GitHub-reviewed advisory GHSA-8w6w-23mq-h8rg lists affected ranges: PyPI linuxfabrik-lib >=0 <=5.0.0)

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