CVE-2026-48553

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-12. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When a custom variable defined on a host, service, or contact is referenced in a shell-executed command line, an authenticated attacker with NRDP access can inject OS commands through the macro value. Exploitation requires a non-default configuration in which a custom variable is defined and referenced in a shell-executed command.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA SSVC

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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 12, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Aug 12, 2026
No patch confirmed yet.
generic

Nagios Core / XI Authenticated RCE via Custom-Variable Macro Injection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nagios-core-xi-authenticated-rce-via-custom-variable-macro-injection
generic

nagioscore/Changelog at master · NagiosEnterprises/nagioscore · GitHub

https://github.com/NagiosEnterprises/nagioscore/blob/master/Changelog
generic

Nagios Core Security Disclosures | Nagios Enterprises

https://www.nagios.com/security-disclosures/nagios-core/

Vendor Advisories for CVE-2026-48553(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nagios44.4.6-4, 4.4.6-4+deb12u1, 4.4.6-4.1, 4.5.12+ds-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nagios44.4.6-4.1, 4.4.6-4.1+deb13u1, 4.5.12+ds-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nagios44.4.6-4.1, 4.5.12+ds-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 93× 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.

Showing the most recent 100 of 184 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 22:30 UTCGHSA enrichment
  3. 2026-10-04 09:06 UTCGHSA enrichment
  4. 2026-10-03 19:59 UTCEG score recompute
  5. 2026-10-03 19:59 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-02 22:00 UTCEG score recompute
  8. 2026-10-02 22:00 UTCGHSA enrichment
  9. 2026-10-02 08:21 UTCEG score recompute
  10. 2026-10-02 08:21 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 10:58 UTCGHSA enrichment
  13. 2026-09-30 21:55 UTCEG score recompute
  14. 2026-09-30 21:55 UTCGHSA enrichment
  15. 2026-09-30 15:03 UTCEPSS rescore
  16. 2026-09-29 04:47 UTCEG score recompute
  17. 2026-09-29 04:47 UTCGHSA enrichment
  18. 2026-09-28 14:43 UTCEG score recompute
  19. 2026-09-28 14:43 UTCGHSA enrichment
  20. 2026-09-28 13:51 UTCEPSS rescore
  21. 2026-09-28 01:26 UTCEG score recompute
  22. 2026-09-28 01:26 UTCGHSA enrichment
  23. 2026-09-27 13:48 UTCEPSS rescore
  24. 2026-09-27 09:55 UTCEG score recompute
  25. 2026-09-27 09:55 UTCGHSA enrichment
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescore
  2. 2026-09-26 00:27 UTCEPSS rescore
  3. 2026-09-25 03:41 UTCEG score recompute
  4. 2026-09-25 03:41 UTCGHSA enrichment
  5. 2026-09-24 12:39 UTCGHSA enrichment
  6. 2026-09-23 23:33 UTCEG score recompute
  7. 2026-09-23 23:33 UTCGHSA enrichment
  8. 2026-09-23 17:53 UTCEPSS rescore
  9. 2026-09-23 10:09 UTCGHSA enrichment
  10. 2026-09-22 21:06 UTCEG score recompute
  11. 2026-09-22 21:06 UTCGHSA enrichment
  12. 2026-09-22 03:17 UTCEG score recompute
  13. 2026-09-22 03:17 UTCGHSA enrichment
  14. 2026-09-21 14:13 UTCGHSA enrichment
  15. 2026-09-21 00:17 UTCEG score recompute
  16. 2026-09-21 00:17 UTCGHSA enrichment
  17. 2026-09-20 20:16 UTCEPSS rescore
  18. 2026-09-20 10:15 UTCGHSA enrichment
  19. 2026-09-19 19:45 UTCEG score recompute
  20. 2026-09-19 19:45 UTCGHSA enrichment
  21. 2026-09-19 06:07 UTCEG score recompute
  22. 2026-09-19 06:07 UTCGHSA enrichment
  23. 2026-09-18 19:28 UTCEPSS rescore
  24. 2026-09-18 16:58 UTCGHSA enrichment
  25. 2026-09-18 02:48 UTCEG score recompute
  26. 2026-09-18 02:48 UTCGHSA enrichment
  27. 2026-09-17 13:45 UTCGHSA enrichment
  28. 2026-09-17 00:22 UTCEG score recompute
  29. 2026-09-17 00:22 UTCGHSA enrichment
  30. 2026-09-16 14:08 UTCEPSS rescore
  31. 2026-09-16 05:15 UTCEPSS rescore
  32. 2026-09-16 02:29 UTCGHSA enrichment
  33. 2026-09-15 13:26 UTCEG score recompute
  34. 2026-09-15 13:26 UTCGHSA enrichment
  35. 2026-09-15 00:23 UTCGHSA enrichment
  36. 2026-09-14 11:02 UTCGHSA enrichment
  37. 2026-09-13 21:59 UTCEG score recompute
  38. 2026-09-13 21:59 UTCGHSA enrichment
  39. 2026-09-13 16:47 UTCEPSS rescore
  40. 2026-09-13 08:56 UTCGHSA enrichment
  41. 2026-09-12 19:53 UTCEG score recompute
  42. 2026-09-12 19:53 UTCGHSA enrichment
  43. 2026-09-12 06:49 UTCEG score recompute
  44. 2026-09-12 06:49 UTCGHSA enrichment
  45. 2026-09-11 17:43 UTCEG score recompute
  46. 2026-09-11 17:43 UTCGHSA enrichment
  47. 2026-09-11 14:53 UTCEPSS rescore
  48. 2026-09-11 03:54 UTCGHSA enrichment
  49. 2026-09-10 14:51 UTCEG score recompute
  50. 2026-09-10 14:51 UTCGHSA enrichment
  51. 2026-09-10 09:35 UTCEPSS rescore
  52. 2026-09-10 01:48 UTCGHSA enrichment
  53. 2026-09-09 10:04 UTCEG score recompute
  54. 2026-09-09 10:04 UTCGHSA enrichment
  55. 2026-09-08 22:01 UTCEPSS rescore
  56. 2026-09-08 20:57 UTCEG score recompute
  57. 2026-09-08 20:57 UTCGHSA enrichment
  58. 2026-09-08 07:59 UTCGHSA enrichment
  59. 2026-09-07 18:56 UTCEG score recompute
  60. 2026-09-07 18:56 UTCGHSA enrichment
  61. 2026-09-07 16:01 UTCEPSS rescore
  62. 2026-09-07 05:53 UTCGHSA enrichment
  63. 2026-09-06 16:29 UTCEG score recompute
  64. 2026-09-06 16:29 UTCGHSA enrichment
  65. 2026-09-06 13:47 UTCEPSS rescore
  66. 2026-09-06 03:25 UTCEG score recompute
  67. 2026-09-06 03:25 UTCGHSA enrichment
  68. 2026-09-05 14:22 UTCGHSA enrichment
  69. 2026-09-05 00:43 UTCEG score recompute
  70. 2026-09-05 00:43 UTCGHSA enrichment
  71. 2026-09-04 07:55 UTCEG score recompute
  72. 2026-09-04 07:55 UTCGHSA enrichment
  73. 2026-09-04 05:06 UTCEPSS rescore
  74. 2026-09-03 16:22 UTCGHSA enrichment
  75. 2026-09-02 23:38 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-48553?
CVE-2026-48553 is a high vulnerability published on August 12, 2026. Nagios Core before 4.5.13 and Nagios XI before 2026R1.5 are vulnerable to authenticated remote code execution via custom-variable macro injection through the Nagios Remote Data Processor (NRDP). When a custom variable defined on a host, service, or contact is referenced in a shell-executed command…
When was CVE-2026-48553 disclosed?
CVE-2026-48553 was first published on August 12, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48553 actively exploited?
CVE-2026-48553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48553?
CVE-2026-48553 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48553?
No fix for CVE-2026-48553 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-48553 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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