CVE-2026-79743 MCPHub: Path Traversal via Malicious MCPB Manifest Name
Attackers can exploit unsanitized manifest names in MCPB uploads to write or delete arbitrary files on the server filesystem.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-79743?
CVE-2026-79743 is a medium-severity path traversal vulnerability in samanhappy mcphub, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 0.12.13, MCPB File Upload Handler extracts a ZIP file and reads manifest.json from it. The name field in the manifest is directly concatenated into a file path (line 107) without any sanitization or path traversal character validation. An attacker can craft a malicious MCPB file where manifest.name is set to something like ../../../etc/malicious, causing the file to be extracted to an arbitrary location on the file system. The cleanupOldMcpbServer function (line 110) also uses the unsanitized name, potentially allowing deletion of arbitrary directories. This issue has been patched in version 0.12.13.
Weakness: CWE-22
Which versions are affected by CVE-2026-79743?
2 open source packages ship an affected version, including @samanhappy/mcphub.
| Package | Affected | Fixed in |
|---|---|---|
@samanhappy/mcphub npm | All versions | 0.12.13 |
@samanhappy/mcphub npm | All versions | 0.12.13 |
How do I fix CVE-2026-79743?
Upgrade @samanhappy/mcphub to 0.12.13 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-79743 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79743 exists.
Sources
Also known as GHSA-p3h2-2j4p-p83g.