Skip to main content
VulnerabilityPublished

CVE-2026-127236: Argument Injection Vulnerability Exists

Source GCVE Database

0
Compare
Authoritative record:CVE-2026-127236· Medium 5.4

Not known to be exploited · CVSS 5.4 Medium · fixed in 2026.0.2 : update Meridian when convenient.

Data as of 12 Nov 2026, 22:33 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (OpenNMS)CVSS 3.15.4
Patch
Available – fixed in 2026.0.2, 2025.0.12, 2024.3.15 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

Upgrade Meridian to 2026.0.2, 2025.0.12 or 2024.3.15; Horizon to 36.0.6.

Affected software

ProductAffectedFixed in
The OpenNMS GroupMeridianAffected
  • >=2026.0.0 <2026.0.2
Fixed in
  • 2026.0.2
The OpenNMS GroupMeridianAffected
  • >=2025.0.0 <2025.0.12
Fixed in
  • 2025.0.12
The OpenNMS GroupMeridianAffected
  • >=2024.1.0 <2024.3.15
Fixed in
  • 2024.3.15
The OpenNMS GroupHorizonAffected
  • >=36.0.0 <36.0.6
Fixed in
  • 36.0.6
GitHubMeridianpkg:github/MeridianOther threatsAffected
  • >=2024.1.0 <2024.3.15
  • >=2025.0.0 <2025.0.12
  • >=2026.0.0 <2026.0.2
Fixed in
  • 2024.3.15
  • 2025.0.12
  • 2026.0.2
GitHubHorizonpkg:github/HorizonOther threatsAffected
  • >=36.0.0 <36.0.6
Fixed in
  • 36.0.6

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to OpenNMS Meridian versions 2024.3.15, 2025.0.12, 2026.0.2 or Horizon 36.0.6 or newer, which include validation of ad-hoc graph parameters against allowlists. Follow vendor guidance to restrict installation to private networks and avoid direct Internet exposure. No additional mitigation is required if these versions are deployed.

Description

An argument injection vulnerability in the ad-hoc RRD graph feature of OpenNMS Meridian and Horizon allows low-privileged authenticated users to inject extra rrdtool arguments. This can lead to server-side request forgery and unauthorized local file reads. The vulnerability does not allow arbitrary OS command execution due to the use of exec with argument arrays and no shell. Fixed versions are available that validate input parameters against allowlists.

References

Community reviews

Loading reviews…