CVE-2026-53759
LowCVSS 2.0Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
Vulnerability in linuxfabrik-lib before version 4.2.0. The db_sqlite.py module created SQLite databases at predictable paths in /tmp and followed attacker-created symbolic links. An attacker with a local monitoring account can create a symlink and trigger a sudo-authorized plugin, leading to arbitrary path overwrite, denial of service, or manipulation of an existing database. Fixed in version 4.2.0.
Risk Assessment
Risk of privilege escalation and system integrity breach. An attacker may overwrite files, cause unavailability, or manipulate databases.
Recommendation
Update linuxfabrik-lib to version 4.2.0 or later. Restrict access to monitoring accounts and secure the /tmp directory.
Other vulnerabilities in linuxfabrik-lib
See all- CVE-2026-73974Medium
Vulnerability in linuxfabrik-lib and Linuxfabrik Monitoring Plugins allows reading files via a hidden --test argument that does not confine paths to the test directory. An attacker controlling the nagios or icinga account can disclose root-readable file contents, e.g., via the deb-updates plugin.
- CVE-2026-55426High
Vulnerability in linuxfabrik-lib and Linuxfabrik Monitoring Plugins. 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 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.
- CVE-2026-67435Medium
A vulnerability in linuxfabrik-lib before version 6.0.0 allows a redirecting server to intercept credential headers (other than Authorization and Cookie) during URL requests. The lib.url.fetch() function forwards headers on cross-origin redirects.
Original NVD description (English source)
linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations. Prior to version 4.2.0, db_sqlite.py created SQLite databases at predictable paths in the shared /tmp directory and followed attacker-created symbolic links at those paths. An attacker who controls a local monitoring account can create a symlink such as /tmp/linuxfabrik-monitoring-plugins-docker-stats.db and then trigger a sudo-authorized plugin, causing the root process to create or modify the symlink target. The primitive can overwrite arbitrary paths, cause denial of service, or manipulate an existing SQLite database through a crafted rollback journal or write-ahead log. The Monitoring Plugins integration also moved plugin caches through lib.db_sqlite.get_db_path() so they use the secured per-user directory. This issue is fixed in version 4.2.0.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS