CVE-2026-111385

Description

Nezha from 2.1.0 before 2.3.15 contains a host header injection vulnerability in mintTransferTool that builds fs.download_url and fs.upload_url transfer URLs from the unvalidated Host header. Attackers who control the Host header seen on a victim's MCP request can redirect file uploads or capture one-time download tokens and replay them to exfiltrate files.

References

• https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f
• https://github.com/nezhahq/nezha/commit/c726930833937a0aebb2a924064f236faea889f6
• https://github.com/nezhahq/nezha/security/advisories/GHSA-rj3w-jrj7-x7c3
• https://www.vulncheck.com/advisories/nezha-2.1.0-before-2.3.15-host-header-injection-via-mcp-transfer-tools