Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-86427

CVE-2026-86427HIGH

LibreNMS before 26.8.0 Argument Injection via graph_title

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   N   H   H   H    8.7   .0060   47.1     —

AFFECTED
  Product   Versions     Fixed
  librenms  unspecified  26.8.0

TIMELINE
  Sep 7   Reserved by VulnCheck
  Sep 7   Published (CNA: VulnCheck)
  Sep 18  EXPLOIT PUBLISHED — CVE-2026-86427 (librenms). Public exploit reference added.

CWE-77 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 7, 2026	Reserved	Reserved by VulnCheck
September 7, 2026	Published	Published (CNA: VulnCheck)
September 18, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-86427 (librenms). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
librenms	librenms	—	—	26.8.0

Weaknesses

CWE-77

References (2)

https://github.com/librenms/librenms/security/advisories/GHSA-3hvv-wxpw-cx83 [Exploit, Mitigation, Vendor Advisory]
https://www.vulncheck.com/advisories/librenms-before-26.8.0-argument-injection-via-graph-title [Third Party Advisory]

Authoritative record: CVE-2026-86427 at cve.org

Vendors: librenms

Weaknesses: CWE-77

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-86427 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.