# CVE-2026-5434: Improper storage of sensitive information

> An attacker can access protected data by probing system files due to improper storage of sensitive information in Honeywell Control Network Modules.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 May 2026
- **Updated:** 30 Jul 2026
- **Also known as:** GHSA-m6f8-6m3m-x2rv

## What is CVE-2026-5434?

CVE-2026-5434 is a medium-severity vulnerability in Honeywell International Inc. Control Network Module (CNM), published on 21 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Honeywell Control
Network Module (CNM) contains
insertion of sensitive information into an unintended directory. An attacker could exploit this vulnerability through probing
system files, potentially resulting in unintended
access to protected data.

Honeywell
recommends updating to the most recent version of this product, service or
offering [200.1]. The CNM versions affected are from [100.1, 101.1, 110.1, and 110.2].

Weakness: CWE-538 (Insertion of Sensitive Information into Externally-Accessible File or Directory)

## Which versions are affected by CVE-2026-5434?


## How do I fix CVE-2026-5434?

No fix has been published for CVE-2026-5434 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5434 being exploited?

There is no known exploitation of CVE-2026-5434 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5434 and fix it if it is affected.

What it is: CVE-2026-5434 is a medium-severity vulnerability in Honeywell International Inc. Control Network Module (CNM), published on 21 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-5434 in the wild and no public exploit code.

Affected product: Honeywell International Inc. Control Network Module (CNM). 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-2026-5434/ (Markdown: https://insights.sbomify.com/CVE-2026-5434/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5434
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5434
- OSV: https://osv.dev/vulnerability/CVE-2026-5434

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5434/
Summaries are generated and may contain mistakes; the official description above is the record.