CVE-2026-42260— Open-WebSearch: SSRF in `fetchWebContent` MCP tool: bracketed IPv6 literals and non-resolving hostname check bypass `isPrivateOrLocalHostname`
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Aas-ee | open-webSearch | < 2.1.7 | affected |
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I. Basic Information for CVE-2026-42260
Vulnerability Information
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Vulnerability Title
Open-WebSearch: SSRF in `fetchWebContent` MCP tool: bracketed IPv6 literals and non-resolving hostname check bypass `isPrivateOrLocalHostname`
Source: NVD (National Vulnerability Database)
Vulnerability Description
Open-WebSearch is a multi-engine MCP server, CLI, and local daemon for agent web search and content retrieval. Prior to 2.1.7, isPublicHttpUrl / assertPublicHttpUrl in src/utils/urlSafety.ts do not recognize bracketed IPv6 literals and do not resolve DNS, which combine to allow non-blind SSRF with the response body returned to the caller. This vulnerability is fixed in 2.1.7.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Open-WebSearch 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-WebSearch是Aasee个人开发者的一个无需API密钥的多引擎网页搜索与内容获取工具。 Open-WebSearch 2.1.7之前版本存在代码问题漏洞，该漏洞源于URL安全检查未识别IPv6字面量且未解析DNS，可能导致非盲目SSRF。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Aas-ee | open-webSearch | < 2.1.7 | - |
II. Public POCs for CVE-2026-42260
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-918
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vercel ai provider-utils download-blob.ts validateDownloadUr - CVE-2026-8725
CoreWorxLab CAAL test-hass Endpoint webhooks.py server-side
V. Comments for CVE-2026-42260
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