medium6.5
CVE-2026-42073
OpenClaude is an open-source coding-agent command line interface for cloud and local model providers.
Impact
OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Prior to version 0.5.1, the OpenClaude MCP authentication flow starts a temporary local HTTP server to handle OAuth callbacks. To prevent CSRF attacks, the server validates a state parameter against an internally stored value. However, due to a logic flaw in the order of conditionals, an attacker can completely bypass this check and force the server to shut down — without knowing the state value at all. This issue has been patched in version 0.5.1.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @gitlawb/openclaude | < 0.5.1 | 0.5.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Gitlawb | Openclaude | before 0.5.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-c73c-x77g-854r
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r
- https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad
- https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-42073