Security readout for executives and security teams
Plain-English summary
CVE-2026-2042 is a high-severity command injection flaw in Nagios Host’s monitoringwizard module. An authenticated attacker with high privileges could make the server run arbitrary commands as the Nagios service account. This is serious for monitoring systems because they often have broad visibility and trusted network access.
Executive priority
Treat as a priority patch-and-access-control item for affected Nagios environments. The privilege requirement lowers likelihood, but compromise of a monitoring server can create broad business impact due to its network visibility and operational role.
Technical view
The flaw is CWE-78: improper validation of user-supplied input before a system call in monitoringwizard. ZDI describes remote code execution against affected Nagios Host installations. CVSS is 7.2: network reachable, low complexity, high privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure appears limited to Nagios Host 2026R1 installations where authenticated high-privilege users can reach the monitoringwizard functionality. Internet-facing or broadly accessible Nagios management interfaces increase operational risk.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV. Exploitation requires authentication with high privileges, but successful exploitation could execute code in the service account context.
Researcher notes
Product naming is somewhat unclear in the bundle: the CVE says Nagios Host 2026R1, while the vendor reference is a Nagios XI changelog. Do not assume unaffected status without checking vendor guidance. No exploit details or active exploitation evidence are provided.
Mitigation direction
- Review the Nagios advisory and changelog for fixed versions or vendor-directed actions.
- Prioritize updates for Nagios Host 2026R1 or related Nagios XI deployments if vendor guidance applies.
- Restrict Nagios administrative access to trusted networks and users.
- Audit privileged Nagios accounts and remove unnecessary access.
- Monitor Nagios servers for unusual child processes, command execution, or configuration changes.
Validation and detection
- Inventory Nagios deployments and identify any Host 2026R1 installations.
- Confirm whether monitoringwizard is present and accessible to privileged users.
- Check installed version against Nagios vendor changelog guidance.
- Review authentication logs for unexpected privileged access.
- Review system and application logs for suspicious commands run by the service account.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-2042 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.2HighVector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- ZDI-26-071CVE reference · x_research-advisory
- vendor-provided URLCVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.