CVE-2026-111385

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 4.0

6.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-25)

CWE

CWE-601

Published

2026-10-16

Modified

2026-10-21

Record from

the NVD, synced 2026-10-21

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
• https://github.com/nezhahq/nezha/security/advisories/GHSA-rj3w-jrj7-x7c3

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