CVE-2026-42260

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Source
https://cve.org/CVERecord?id=CVE-2026-42260
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42260.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-42260
Aliases
Published
2026-05-12T14:09:05Z
Modified
2026-10-21T02:57:49Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N CVSS Calculator
Summary
Open-WebSearch: SSRF in `fetchWebContent` MCP tool: bracketed IPv6 literals and non-resolving hostname check bypass `isPrivateOrLocalHostname`
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42260.json"
}
References

Affected packages

Git / github.com/aas-ee/open-websearch

Affected ranges

Type
GIT
Repo
https://github.com/aas-ee/open-websearch
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
739aef2bf7f2c822236bcce0f404c43b57f42503
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2.1.7"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2.1.7"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

Affected versions

v1.*
v1.0
v1.1
v1.1.1
v1.1.4
v1.1.4.1
v1.1.4.2
v1.1.5
v1.1.5.1
v1.1.6
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.2.5
v1.2.6
v1.2.7
v2.*
v2.0.0
v2.0.1
v2.0.2
v2.1.5
v2.1.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42260.json"