Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck
CVE-2026-111385Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools
Medium 4.8
In plain English
A medium-severity open redirect in nezha from nezhahq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.2%top 85.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-rj3w-jrj7-x7c3) vendor-advisory
- Patch Commit patch
- Patch Commit patch
- VulnCheck Advisory: Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools third-party-advisory