# CVE-2026-33389: Security feature bypass in Arc

> Attackers can intercept credentials via man-in-the-middle attacks due to disabled certificate validation in Smart Polling, allowing device access and tampering.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:L/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-8g88-35qx-36v7

## What is CVE-2026-33389?

CVE-2026-33389 is a medium-severity vulnerability in Nozomi Networks Arc, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-671 (Lack of Administrator Control over Security)

## Which versions are affected by CVE-2026-33389?


## How do I fix CVE-2026-33389?

No fix has been published for CVE-2026-33389 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33389 being exploited?

There is no known exploitation of CVE-2026-33389 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33389 and fix it if it is affected.

What it is: CVE-2026-33389 is a medium-severity vulnerability in Nozomi Networks Arc, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-33389 in the wild and no public exploit code.

Affected product: Nozomi Networks Arc. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33389/ (Markdown: https://insights.sbomify.com/CVE-2026-33389/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33389
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33389
- OSV: https://osv.dev/vulnerability/CVE-2026-33389

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33389/
Summaries are generated and may contain mistakes; the official description above is the record.