Medium severity · published Oct 16, 2026
CVE-2026-111385
Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools
4.8
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
nezha · nezhahq
2.1.0 before 2.3.15 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111385
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111385
github.com
https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f
github.com
https://github.com/nezhahq/nezha/commit/c726930833937a0aebb2a924064f236faea889f6
github.com
https://github.com/nezhahq/nezha/security/advisories/GHSA-rj3w-jrj7-x7c3
www.vulncheck.com
https://www.vulncheck.com/advisories/nezha-2.1.0-before-2.3.15-host-header-injection-via-mcp-transfer-tools
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