# CVE-2026-91837: Networkmanager-iodine: networkmanager-iodine: local privilege escalation to root via nameserver option injection

> Local attackers can inject shell commands via the nameserver setting in NetworkManager-iodine to execute arbitrary code with root privileges.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Sep 2026
- **Updated:** 25 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-91837, GHSA-hrpv-95c6-mpj2, UBUNTU-CVE-2026-91837

## What is CVE-2026-91837?

CVE-2026-91837 is a high-severity command injection vulnerability in GNOME NetworkManager-iodine, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in NetworkManager-iodine, the iodine VPN plugin for NetworkManager. A local unprivileged user can exploit a vulnerability in how the 'nameserver' setting is processed when establishing an iodine VPN connection. By embedding shell metacharacters (special characters that can execute commands) in the 'nameserver' value, an attacker can inject and execute arbitrary commands. These commands run with root privileges before the application drops its elevated permissions, leading to local privilege escalation.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-91837?


## How do I fix CVE-2026-91837?

No fix has been published for CVE-2026-91837 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-91837 being exploited?

There is no known exploitation of CVE-2026-91837 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-91837 and fix it if it is affected.

What it is: CVE-2026-91837 is a high-severity command injection vulnerability in GNOME NetworkManager-iodine, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-91837 in the wild and no public exploit code.

Affected product: GNOME NetworkManager-iodine. 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-2026-91837/ (Markdown: https://insights.sbomify.com/CVE-2026-91837/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-91837
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-91837
- OSV: https://osv.dev/vulnerability/CVE-2026-91837

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-91837/
Summaries are generated and may contain mistakes; the official description above is the record.