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CVE-2026-42260

Open-WebSearch: SSRF in `fetchWebContent` MCP tool: bracketed IPv6 literals and non-resolving hostname check bypass `isPrivateOrLocalHostname` PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Aas-ee / open-webSearchaffected < 2.1.7

CWE

CWE-918

References

ADP enrichment

CISA-ADP

No English description supplied.