CVE-2026-49856

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Source
https://cve.org/CVERecord?id=CVE-2026-49856
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49856.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49856
Aliases
Published
2026-08-13T15:00:26.022Z
Modified
2026-08-15T11:46:03.125198264Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
@jshookmcp/jshook: ICMP probe and traceroute skip local-network SSRF authorization
Details

@jshookmcp/jshook is an MCP server that gives AI agents tools for JavaScript analysis and security research. In version 0.3.1, he network domain has a central SSRF authorization policy that blocks private, loopback, link-local, and reserved targets unless an explicit authorization object allows private network access. The policy is enforced by raw HTTP/TCP/TLS RTT tools, but the ICMP probe and traceroute tools resolve the target and invoke the native ICMP/traceroute sink directly. An MCP client with access to an active network domain can therefore ask the jshookmcp server to probe internal addresses even when local SSRF access is disabled for the other raw network tools. This exposes an internal reachability and route mapping primitive from the server network position. Version 0.3.2 fixes the issue.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49856.json"
}
References

Affected packages

Git / github.com/vmoranv/jshookmcp

Affected ranges

Type
GIT
Repo
https://github.com/vmoranv/jshookmcp
Events
Introduced
53fe0c9fe4df661081d49efe637de915e40a55eb
Fixed
02111311f7bd0f86a7d7ef8538986594b3a18afa
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "= 0.3.1"
        },
        {
            "last_affected": "= 0.3.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

= 0.*
= 0.3.1
v0.*
v0.3.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49856.json"