{"id":"CVE-2026-111385","title":"Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools","summary":"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…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-601"],"vendor":"nezhahq","product":"nezha","affected":["nezha >= 2.1.0 < 2.3.15"],"published":"2026-10-16","updated":"2026-10-16","sourceUpdated":"2026-10-16T01:17:54.057Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111385","references":[{"url":"https://github.com/nezhahq/nezha/security/advisories/GHSA-rj3w-jrj7-x7c3","label":"GitHub Security Advisory (GHSA-rj3w-jrj7-x7c3)"},{"url":"https://github.com/nezhahq/nezha/commit/36b742a7e9a81ed782363dd19efd77b7030fbd0f","label":"Patch Commit"},{"url":"https://github.com/nezhahq/nezha/commit/c726930833937a0aebb2a924064f236faea889f6","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/nezha-2.1.0-before-2.3.15-host-header-injection-via-mcp-transfer-tools","label":"VulnCheck Advisory: Nezha 2.1.0 before 2.3.15 Host Header Injection via MCP Transfer Tools"}],"tags":["cve.org"],"ingestedAt":"2026-10-16T01:55:57.992Z","slug":"CVE-2026-111385","body":"## Overview\n\nNezha 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.\n\n## Affected\n\n- `nezha >= 2.1.0 < 2.3.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}