Open-WebSearch — Ssrf (CVE-2026-42260)
Date: 2026-05
Attack vector: ssrf
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-42260
CWE: CWE-918
CVSS: 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):