Vulnerabilities CVE-2026-42260

CVE-2026-42260

High

Open

TLP:CLEAR

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

NVD CVE.org

Critical Infrastructure

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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.

Details

CVSS Score: 8.2
EPSS Score ⓘ: 0.22%

12.1th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Confidence: 90%
Published: May 12, 2026
Last Modified: May 14, 2026

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