# CVE-2026-67438: OliveTin OS Command Injection via Custom regex: Argument Type Bypassing Shell Safety Check

> An attacker can execute arbitrary OS commands via regex arguments in OliveTin due to insufficient shell safety checks.

- **Severity:** Medium 6.6 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Jul 2026
- **Updated:** 30 Jul 2026
- **Also known as:** GHSA-xc5w-4v5w-7x65, GO-2026-6145

## What is CVE-2026-67438?

CVE-2026-67438 is a medium-severity command injection vulnerability in OliveTin, published on 29 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

OliveTin gives access to predefined shell commands from a web interface. From 3000.2.0 until 3000.17.0, the service/internal/executor/arguments.go checkShellArgumentSafety function does not treat regex: custom argument types as unsafe for Shell mode actions, allowing values that pass typeSafetyCheckRegex to be interpolated by wrapCommandInShell into an sh -c command string and enabling OS command injection. This issue is fixed in version 3000.17.0.

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

## Which versions are affected by CVE-2026-67438?

3 open source packages ship an affected version, including github.com/OliveTin/OliveTin.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/OliveTin/OliveTin` | Go | From 0.0.0-20251025234746-ef5a67e7b8ea | 0.0.0-20260708084548-995ff79736f2 |
| `github.com/OliveTin/OliveTin` | Go | From 0.0.0-20251025234746-ef5a67e7b8ea | 0.0.0-20260708084548-995ff79736f2 |
| `github.com/OliveTin/OliveTin` | Go | From 0.0.0-20251025234746-ef5a67e7b8ea | 0.0.0-20260708084548-995ff79736f2 |

## How do I fix CVE-2026-67438?

Upgrade github.com/OliveTin/OliveTin to 0.0.0-20260708084548-995ff79736f2 or later.

## Is CVE-2026-67438 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67438 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-67438 and fix it if it is affected.

What it is: CVE-2026-67438 is a medium-severity command injection vulnerability in OliveTin, published on 29 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67438 exists.

Affected packages and fixed versions:
- github.com/OliveTin/OliveTin (Go): affected from 0.0.0-20251025234746-ef5a67e7b8ea; fixed in 0.0.0-20260708084548-995ff79736f2
- github.com/OliveTin/OliveTin (Go): affected from 0.0.0-20251025234746-ef5a67e7b8ea; fixed in 0.0.0-20260708084548-995ff79736f2
- github.com/OliveTin/OliveTin (Go): affected from 0.0.0-20251025234746-ef5a67e7b8ea; fixed in 0.0.0-20260708084548-995ff79736f2

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-2026-67438/ (Markdown: https://insights.sbomify.com/CVE-2026-67438/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-67438
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-67438
- OSV: https://osv.dev/vulnerability/CVE-2026-67438

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-67438/
Summaries are generated and may contain mistakes; the official description above is the record.