CVE-2026-79749

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Source

https://cve.org/CVERecord?id=CVE-2026-79749

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-79749.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-79749

Aliases

GHSA-pr4x-3pc7-2fhw

Published

2026-08-31T17:54:45Z

Modified

2026-10-28T02:30:51Z

Severity

7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

MCPHub: SSRF Guard Bypass via IPv6 Transition Addresses in URL Validation

Details

MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 1.0.32, MCPHub's SSRF guard in src/utils/ssrf.ts uses a custom isBlockedIpv6 function that only checks for loopback, link-local, unique-local, IPv4-mapped, and IPv4-compatible IPv6 addresses. IPv6 transition address families -- NAT64 (64:ff9b::/96), 6to4 (2002::/16), and Teredo (2001::/32) -- are not checked. An attacker who can specify a URL for an MCP server connection can encode a private IPv4 address inside one of these IPv6 forms to bypass the SSRF guard and reach internal infrastructure. This issue has been patched in version 1.0.32.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79749.json"
}

References

Affected packages

Git / github.com/samanhappy/mcphub

Affected ranges

Type

GIT

Repo

https://github.com/samanhappy/mcphub

Events

Introduced

Fixed

20e3ba73aea03c493669f90526436a9a576f9c6c

Fixed

2b10ae36112ce68deebf910b22505d44efcef552

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.0.32"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "2b10ae36112ce68deebf910b22505d44efcef552"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v1.0.32",
            "range":  [
                {
                    "fixed":  "20e3ba73aea03c493669f90526436a9a576f9c6c"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*

v0.1.0

v0.1.1

v0.10.0

v0.10.1

v0.10.2

v0.10.3

v0.10.4

v0.10.5

v0.10.6

v0.11.0

v0.11.1

v0.11.10

v0.11.11

v0.11.12

v0.11.13

v0.11.2

v0.11.3

v0.11.4

v0.11.5

v0.11.6

v0.11.7

v0.11.8

v0.11.9

v0.12.0

v0.12.1

v0.12.10

v0.12.11

v0.12.12

v0.12.13

v0.12.14

v0.12.15

v0.12.16

v0.12.17

v0.12.2

v0.12.3

v0.12.4

v0.12.5

v0.12.6

v0.12.7

v0.12.8

v0.12.9

v0.2.0

v0.3.0

v0.3.1

v0.3.2

v0.3.3

v0.3.4

v0.3.5

v0.3.6

v0.3.7

v0.3.8

v0.4.0

v0.4.1

v0.4.2

v0.4.3

v0.5.0

v0.5.1

v0.5.2

v0.5.3

v0.5.4

v0.6.0

v0.6.1

v0.6.2

v0.7.0

v0.7.1

v0.7.2

v0.7.3

v0.7.4

v0.7.5

v0.7.6

v0.7.7

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.8.4

v0.8.5

v0.8.6

v0.8.7

v0.9.0

v0.9.1

v0.9.10

v0.9.11

v0.9.12

v0.9.13

v0.9.14

v0.9.15

v0.9.16

v0.9.2

v0.9.3

v0.9.4

v0.9.5

v0.9.6

v0.9.7

v0.9.8

v0.9.9

v1.*

v1.0.0

v1.0.1

v1.0.10

v1.0.11

v1.0.12

v1.0.13

v1.0.14

v1.0.15

v1.0.16

v1.0.17

v1.0.18

v1.0.19

v1.0.2

v1.0.20

v1.0.21

v1.0.22

v1.0.23

v1.0.24

v1.0.25

v1.0.26

v1.0.27

v1.0.28

v1.0.29

v1.0.3

v1.0.30

v1.0.4

v1.0.5

v1.0.6

v1.0.7

v1.0.8

v1.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-79749.json"