CVE-2026-55426

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
51(Track*)
EG Risk 51/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

July 6, 2026

Last Modified

September 9, 2026

Advisory Details (6)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github_commit, github.
github Patch Available🟡 PoC Available

Local privilege escalation using embedded command · Advisory · Linuxfabrik/monitoring-plugins · GitHub

https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-798h-hpph-m24j
github_release Patch Available

v6.0.0

Patch available: Linuxfabrik/monitoring-plugins v6.0.0

https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v6.0.0
github_commit Patch Available

commit 23bb570f41fc (Linuxfabrik/monitoring-plugins)

Patch available: Linuxfabrik/monitoring-plugins v6.0.0 (contains commit 23bb570f41fc)

https://github.com/Linuxfabrik/monitoring-plugins/commit/23bb570f41fc8d9caf30b30074bba0e3db1b357a
generic

monitoring-plugins/CHANGELOG.md at main · Linuxfabrik/monitoring-plugins · GitHub

https://github.com/Linuxfabrik/monitoring-plugins/blob/main/CHANGELOG.md
github_release Patch Available

v5.0.0

Patch available: Linuxfabrik/lib v5.0.0

https://github.com/Linuxfabrik/lib/releases/tag/v5.0.0
generic

lib/CHANGELOG.md at main · Linuxfabrik/lib · GitHub

https://github.com/Linuxfabrik/lib/blob/main/CHANGELOG.md

Vendor Advisories for CVE-2026-55426(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
linuxfabrik-lib2.0.0.0 ... 4.4.0 (25 versions)5.0.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-09 22:57 UTCEG score recompute
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 14:10 UTCEG score recompute
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-05 22:59 UTCEG score recompute
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 14:12 UTCEPSS rescore
  11. 2026-09-01 13:54 UTCEPSS rescore
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 07:59 UTCEG score recompute
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-28 21:41 UTCEPSS rescore
  16. 2026-08-27 21:57 UTCEG score recompute
  17. 2026-08-27 14:25 UTCEPSS rescore
  18. 2026-08-27 02:05 UTCEG score recompute
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-26 13:54 UTCEG score recompute
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-24 15:00 UTCEG score recompute
  23. 2026-08-22 04:46 UTCEG score recompute
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 06:13 UTCEG score recompute
Show 10 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 19:19 UTCEG score recompute
  3. 2026-08-20 18:32 UTCEG score recompute
  4. 2026-08-20 02:24 UTCEG score recompute
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-18 21:36 UTCEG score recompute
  7. 2026-07-30 16:15 UTCEG score recompute
  8. 2026-07-26 12:46 UTCEG score recompute
  9. 2026-07-23 03:20 UTCEG score recompute
  10. 2026-07-06 21:35 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55426?
CVE-2026-55426 is a high vulnerability published on July 6, 2026. 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…
When was CVE-2026-55426 disclosed?
CVE-2026-55426 was first published in the National Vulnerability Database on July 6, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55426 actively exploited?
CVE-2026-55426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.4% of all scored CVEs.
What is the CVSS score of CVE-2026-55426?
CVE-2026-55426 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-55426?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55426, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55426

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