CVE-2026-86427

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-07. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows authenticated attackers to inject arbitrary rrdtool arguments by breaking out of double-quote escaping. Attackers can inject DEF and LINE arguments to read RRD files from unauthorized devices, or use newline injection to execute arbitrary rrdtool commands, bypassing per-device authorization checks.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 7, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

LibreNMS before 26.8.0 Argument Injection via graph_title | Advisories | VulnCheck

https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title
github Patch Available🟡 PoC Available

RRDtool Argument Injection via Unsanitized Double Quotes in graph_title Parameter · Advisory · librenms/librenms · GitHub

https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83

Vendor Advisories for CVE-2026-86427(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 57× 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. 2026-09-21 07:27 UTCEG score recompute
  2. 2026-09-21 07:27 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 19:20 UTCGHSA enrichment
  5. 2026-09-20 07:12 UTCGHSA enrichment
  6. 2026-09-19 19:04 UTCEG score recompute
  7. 2026-09-19 19:04 UTCGHSA enrichment
  8. 2026-09-19 06:54 UTCEG score recompute
  9. 2026-09-19 06:54 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:47 UTCGHSA enrichment
  12. 2026-09-18 08:28 UTCGHSA enrichment
  13. 2026-09-17 20:21 UTCEG score recompute
  14. 2026-09-17 20:21 UTCGHSA enrichment
  15. 2026-09-17 19:32 UTCEPSS rescore
  16. 2026-09-17 07:04 UTCGHSA enrichment
  17. 2026-09-16 18:57 UTCEG score recompute
  18. 2026-09-16 18:57 UTCGHSA enrichment
  19. 2026-09-16 14:09 UTCEPSS rescore
  20. 2026-09-16 06:49 UTCEG score recompute
  21. 2026-09-16 06:49 UTCGHSA enrichment
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 18:41 UTCGHSA enrichment
  24. 2026-09-15 06:28 UTCEG score recompute
  25. 2026-09-15 06:28 UTCGHSA enrichment
Show 32 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-15 03:12 UTCEPSS rescore
  3. 2026-09-14 18:21 UTCGHSA enrichment
  4. 2026-09-14 05:16 UTCGHSA enrichment
  5. 2026-09-13 17:09 UTCEG score recompute
  6. 2026-09-13 17:09 UTCGHSA enrichment
  7. 2026-09-13 05:01 UTCGHSA enrichment
  8. 2026-09-12 16:54 UTCEG score recompute
  9. 2026-09-12 16:54 UTCGHSA enrichment
  10. 2026-09-12 04:47 UTCGHSA enrichment
  11. 2026-09-11 16:40 UTCEG score recompute
  12. 2026-09-11 16:40 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 04:32 UTCGHSA enrichment
  16. 2026-09-10 16:25 UTCEG score recompute
  17. 2026-09-10 16:25 UTCGHSA enrichment
  18. 2026-09-10 15:27 UTCEG score recompute
  19. 2026-09-10 15:27 UTCGHSA enrichment
  20. 2026-09-10 11:27 UTCEG score recompute
  21. 2026-09-10 11:27 UTCGHSA enrichment
  22. 2026-09-09 23:18 UTCGHSA enrichment
  23. 2026-09-09 08:20 UTCEG score recompute
  24. 2026-09-09 08:20 UTCGHSA enrichment
  25. 2026-09-08 22:01 UTCEPSS rescore
  26. 2026-09-08 20:13 UTCGHSA enrichment
  27. 2026-09-08 16:15 UTCGHSA enrichment
  28. 2026-09-08 01:36 UTCEG score recompute
  29. 2026-09-08 01:36 UTCGHSA enrichment
  30. 2026-09-07 13:28 UTCEG score recompute
  31. 2026-09-07 12:58 UTCEG score recompute
  32. 2026-09-07 12:56 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86427?
CVE-2026-86427 is a high vulnerability published on September 7, 2026. LibreNMS before 26.8.0 contains an argument injection vulnerability in the graph_title parameter that allows authenticated attackers to inject arbitrary rrdtool arguments by breaking out of double-quote escaping. Attackers can inject DEF and LINE arguments to read RRD files from unauthorized…
When was CVE-2026-86427 disclosed?
CVE-2026-86427 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86427 actively exploited?
CVE-2026-86427 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 73.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86427?
CVE-2026-86427 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-86427?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86427, 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

Explore the affected products and dependency analysis for CVE-2026-86427

Explore →

Is Your Infrastructure Affected by CVE-2026-86427?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs