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TI-2026-39994 Aliases CVE-2026-55426GHSA-798h-hpph-m24j

linuxfabrik-lib: Local privilege escalation using embedded command

Priority HIGH 69CWE-78Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-78.

Summary

linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations, and Linuxfabrik Monitoring Plugins uses those modules to run external monitoring commands. From the earliest affected releases until linuxfabrik-lib 5.0.0 and Linuxfabrik Monitoring Plugins 6.0.0, check plugins embedded user-controlled values in command strings passed to lib.shell.shell_exec(), which split strings at pipe characters and executed the resulting commands. In check-plugins/restic-check/restic-check, the --repo parameter could inject a pipe-delimited command into a constructed restic invocation, and sudo-authorized execution allowed a compromised nagios or icinga account to run that command as root. The shared library also accepted command strings and a shell parameter, while numerous plugins constructed external commands from attacker-influenced arguments. The fixes require argv lists, always use shell=False, remove pipe splitting, and reject option-like positional values through lib.shell.safe_cli_value(). These issues are fixed in linuxfabrik-lib 5.0.0 and Linuxfabrik Monitoring Plugins 6.0.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00211 11th percentileScored 2026-11-07
Fix Fixed monitoring-plugins (Linuxfabrik): 6.0.0lib (Linuxfabrik): 5.0.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Linuxfabrikmonitoring-pluginsbefore 6.0.06.0.0Patch availableCNA
Linuxfabriklibbefore 5.0.05.0.0Patch availableCNA
—linuxfabrik-lib (PyPI)before 5.0.05.0.0Patch availableGHSA-798h-hpph-m24j
  • monitoring-plugins VendorLinuxfabrik Affected before 6.0.0 Fixed in 6.0.0 Patch available CNA
  • lib VendorLinuxfabrik Affected before 5.0.0 Fixed in 5.0.0 Patch available CNA
  • linuxfabrik-lib (PyPI) Vendor— Affected before 5.0.0 Fixed in 5.0.0 Patch available GHSA-798h-hpph-m24j

Remediation

  • Fix · CNA monitoring-plugins (Linuxfabrik) Fixed in 6.0.0
  • Fix · CNA lib (Linuxfabrik) Fixed in 5.0.0
  • Fix · GHSA-798h-hpph-m24j linuxfabrik-lib (PyPI) Fixed in 5.0.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55426
  2. 2026-10-03 Alias added: GHSA-798h-hpph-m24j

References

Other 7

  • TI-2026-37926 Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation CVSS 4.0HIGH 7.0
  • TI-2026-51979 linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sudoers-whitelisted plugins (LPE) CVSS 3.1MEDIUM 5.5
  • TI-2026-51978 Linuxfabrik Monitoring Plugins: Arbitrary root file disclosure via unconfined --filename in logfile plugin (sudoers LPE) CVSS 3.1MEDIUM 5.5
  • TI-2026-38766 linuxfabrik-lib: Insecure creation of SQLite databases CVSS 4.0LOW 2.0
  • TI-2026-47716 Linuxfabrik monitoring-plugins: SSRF and auth-token disclosure via unvalidated @odata.id link in redfish-* plugins CVSS 4.0HIGH 8.3
  • TI-2026-47715 linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect CVSS 4.0MEDIUM 6.0
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences