linuxfabrik-lib: Local privilege escalation using embedded command

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55426
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-18 21:16:36 UTC
Updated2026-08-18 21:16:36 UTC
Descriptionlinuxfabrik-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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-78 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linuxfabrik Monitoring-plugins affected < 6.0.0 Not specified
CNA Linuxfabrik Lib affected < 5.0.0 Not specified

References

ReferenceSourceLinkTags
github.com/Linuxfabrik/lib/releases/tag/v5.0.0 [email protected] github.com
github.com/Linuxfabrik/monitoring-plugins/commit/23bb570f41fc8d9caf30b30... [email protected] github.com
github.com/Linuxfabrik/monitoring-plugins/releases/tag/v6.0.0 [email protected] github.com
github.com/Linuxfabrik/monitoring-plugins/blob/main/CHANGELOG.md [email protected] github.com
github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-798h-... [email protected] github.com
github.com/Linuxfabrik/lib/blob/main/CHANGELOG.md [email protected] github.com
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