CVE-2026-73973

MEDIUMPre-NVD 5.55.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (19th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
5.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 7.0.0, check-plugins/logfile/logfile accepted a free-form --filename path and opened it as root when invoked through the shipped nagios or icinga sudoers allowlist, without confining the resolved path to /var/log. An attacker who controls the monitoring account can select a root-readable file such as /etc/shadow and use --warning-regex . while leaving SUPPRESS_OUTPUT false, causing each nonempty line to be collected in warn_matches and returned through lib.base.oao(). The vulnerable flow passes the expanded scan_path directly to open(), and neither real-path containment nor an allowlist protects the sink. The same fix also confines mysql-logfile and openvpn-client-list paths, allows only documented log roots, and resolves symlinks and parent-directory traversal before checking containment. This issue is fixed in version 7.0.0.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
41
EG Risk 41/100

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 (value × EchelonGraph’s weight)
Severity55% × 45%
The EG Score, 5.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 18, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 18, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Arbitrary root file disclosure via unconfined --filename in logfile plugin (sudoers LPE) · Advisory · Linuxfabrik/monitoring-plugins · GitHub

https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-f54c-p5vg-mr5c
GitHub release Patch Available

v7.0.0

Patch available: Linuxfabrik/monitoring-plugins v7.0.0

https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v7.0.0
GitHub commit Patch Available

commit a0ca1268d84e (Linuxfabrik/monitoring-plugins)

Patch available: Linuxfabrik/monitoring-plugins v7.0.0 (contains commit a0ca1268d84e)

https://github.com/Linuxfabrik/monitoring-plugins/commit/a0ca1268d84e0caf10442b9c7477d699b52d1c92
Web page

monitoring-plugins/CHANGELOG.md at ae486fc629e1ca9373e1b6dd5e395603ee453bbc · Linuxfabrik/monitoring-plugins · GitHub

https://github.com/Linuxfabrik/monitoring-plugins/blob/ae486fc629e1ca9373e1b6dd5e395603ee453bbc/CHANGELOG.md#v700---2026-08-14

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 53× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-12 15:40 UTCEG score recompute
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  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
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  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
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  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-10-01 07:20 UTCEG score recompute
  25. 2026-09-30 08:54 UTCEG score recompute
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  1. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-09-29 04:11 UTCEG score recompute
  3. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 19th percentile
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  5. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
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  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-09-25 00:58 UTCEG score recompute
  10. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 18th percentile
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  15. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
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  18. 2026-09-20 05:30 UTCEG score recompute
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  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
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  30. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  31. 2026-09-11 19:31 UTCEG score recompute
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  39. 2026-09-05 17:28 UTCEG score recompute
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  50. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
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  55. 2026-08-27 07:56 UTCEG score recompute
  56. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  57. 2026-08-26 09:29 UTCEG score recompute
  58. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  59. 2026-08-25 11:03 UTCEG score recompute
  60. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  61. 2026-08-24 12:36 UTCEG score recompute
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  63. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 12th percentile
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  65. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
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  68. 2026-08-19 20:23 UTCEG score recompute
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  70. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  71. 2026-08-18 22:24 UTCEG score recompute
  72. 2026-08-18 21:23 UTCEG score recomputeFirst assessed: 5.5 MEDIUM
  73. 2026-08-18 21:23 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-73973?
CVE-2026-73973 is a medium-severity vulnerability; its CVE record was published on August 18, 2026. Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 7.0.0, check-plugins/logfile/logfile accepted a free-form --filename path and opened it as root when invoked through the shipped nagios or icinga sudoers allowlist, without confining…
When was the CVE record for CVE-2026-73973 published?
The CVE record for CVE-2026-73973 was published on August 18, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-73973 actively exploited?
CVE-2026-73973 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73973?
CVE-2026-73973 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73973?
A fix for CVE-2026-73973 is available: update to the fixed version the vendor names in its advisory.

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