Disabled and non-configurable certificate/host key validation in Smart Polling in Guardian/CMC before 26.3.0 and Arc before v2.7.0 (CVE-2026-33389) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-33389

Disabled and non-configurable certificate/host key validation in Smart Polling in Guardian/CMC before 26.3.0 and Arc before v2.7.0

Answer in brief

CVE-2026-33389 records a Unknown severity vulnerability in Disabled and non-configurable certificate/host key validation in Smart Polling in Guardian/CMC before 26.3.0 and Arc before v2.7.0. The current sources do not mark it as known exploited. The current feed maps Nozomi Networks/Arc (generic), Nozomi Networks/CMC (generic), Nozomi Networks/Guardian (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 8, 2026Updated Sep 8, 2026Source checked Sep 8, 2026First seen by HOL Sep 8, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Nozomi Networks/Arc (generic), Nozomi Networks/CMC (generic), Nozomi Networks/Guardian (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Nozomi Networks/Arcgeneric	>=0 <2.7.0	2.7.0
Nozomi Networks/CMCgeneric	>=0 <26.3.0	26.3.0
Nozomi Networks/Guardiangeneric	>=0 <26.3.0	26.3.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Nozomi Networks/Arc, Nozomi Networks/CMC, Nozomi Networks/Guardian.
Review the reported fix. Update Nozomi Networks/Arc to 2.7.0; Nozomi Networks/CMC to 26.3.0; Nozomi Networks/Guardian to 26.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 8, 2026

Sources and claim methodology

Source referencesecurity.nozominetworks.com

Upstream source description

An improper certificate/host key validation vulnerability was discovered in the Smart Polling functionality, which established encrypted connections to target devices without validating the remote host's identity, and no option was provided to enable it. A man-in-the-middle attacker positioned between a sensor and a polled device can, during a polling session, impersonate the device and intercept the communication, including the credentials used to access it. The captured credentials can then be replayed to authenticate against the device itself or against other devices sharing the same credentials, allowing the attacker to access and tamper with the device's data and to disrupt its operations.

Quoted source text, attributed separately from HOL analysis.