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CVE-2026-111385— Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools

Quick assessment

Affected
nezhahq nezha
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

哪吒（Nezha）2.1.0 至 2.3.15 版本（不含 2.3.15）在 中存在主机头注入漏洞。该模块使用未经验证的主机头（Host header）构建文件下载链接（fs.download_url）和文件上传链接（fs.upload_url），从而生成传输 URL。 攻击者若能够控制受害者 MCP 请求中的 Host 头，便可能将文件上传重定向至恶意地址，或窃取一次性下载令牌（token），并通过重放该令牌的方式实现文件泄露。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2026-111385

Vulnerability Information
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Vulnerability Title
Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nezhahq nezha 2.1.0 ~ 2.3.15 -

II. Public POCs for CVE-2026-111385

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III. Intelligence Information for CVE-2026-111385

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Patches & Fixes for CVE-2026-111385 (1)

Vendor Advisories for CVE-2026-111385 (2)

Same Patch Batch · nezhahq · 2026-10-16 · 5 CVEs total

CVE-2026-111387 6.5 MEDIUM Nezha 2.2.5 before 2.3.15 Information Disclosure via DDNS List Endpoint
CVE-2026-111383 6.5 MEDIUM Nezha 2.0.13 before 2.3.15 Denial of Service via /api/v1/ws/transfer WebSocket
CVE-2026-111384 6.5 MEDIUM Nezha 1.0.0 before 2.3.15 Memory Exhaustion via File Manager WebSocket
CVE-2026-111386 4.3 MEDIUM Nezha 1.7.0 before 2.3.15 Cross-Tenant Server-ID Enumeration via getServerConfig

IV. Related Vulnerabilities

Same product: nezha
Same vendor: nezhahq
Same weakness: CWE-601

V. Comments for CVE-2026-111385

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