CVE-2026-58196

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Source

https://cve.org/CVERecord?id=CVE-2026-58196

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58196.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-58196

Aliases

Downstream

openSUSE-SU-2026:21483-1

Related

openSUSE-SU-2026:21483-1

Published

2026-09-15T15:53:45Z

Modified

2026-09-17T03:47:01Z

Severity

4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N CVSS Calculator

Summary

ToolHive: SSRF in remote MCP server authentication discovery (host-side, bypasses container isolation)

Details

ToolHive is a utility designed to simplify the deployment and management of Model Context Protocol (MCP) servers. Prior to 0.31.0, remote.Handler.Authenticate in pkg/auth/remote/handler.go invokes discovery.DetectAuthenticationFromServer in pkg/auth/discovery/discovery.go, whose host-side HTTP clients trust remote-server-controlled authentication discovery destinations, follow redirects without host or scheme restrictions, and do not consistently block private addresses. A malicious or compromised remote MCP server can place a resource_metadata URL in WWW-Authenticate for ParseWWWAuthenticate to extract, after which FetchResourceMetadata, OIDC issuer discovery, and well-known discovery can issue GET requests to link-local, RFC1918, or other internal services outside the server's container. The user connects to a server that the user intends to use, but the server controls the internal destination; this path does not depend on the separate NAT64 guard omission because the affected clients did not invoke IsPrivateIP, and it differs from the DCR resolver path that already refused redirects. The demonstrated primitive reaches internal-only HTTP services and reachability or error oracles, and can retrieve AWS metadata credentials where IMDSv1 accepts an unauthenticated GET, while IMDSv2 and GCP metadata prerequisites are not satisfied by the demonstrated request. This vulnerability is fixed in 0.31.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58196.json"
}

References

Affected packages

Git / github.com/stacklok/toolhive

Affected ranges

Type

GIT

Repo

https://github.com/stacklok/toolhive

Events

Introduced

Fixed

4ea6afb9048ddec1d56875fa9e0da36d65c15966

Fixed

493d030ed24b8c012db4c5717475a2386f5b72ce

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.31.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

toolhive-operator-0.*

toolhive-operator-0.0.10

toolhive-operator-0.0.11

toolhive-operator-0.0.3

toolhive-operator-0.0.4

toolhive-operator-0.0.5

toolhive-operator-0.0.6

toolhive-operator-0.0.7

toolhive-operator-0.0.8

toolhive-operator-0.0.9

toolhive-operator-0.1.0

toolhive-operator-0.1.5

toolhive-operator-0.1.8

toolhive-operator-0.2.0

toolhive-operator-0.2.1

toolhive-operator-0.2.11

toolhive-operator-0.2.12

toolhive-operator-0.2.13

toolhive-operator-0.2.14

toolhive-operator-0.2.15

toolhive-operator-0.2.16

toolhive-operator-0.2.17

toolhive-operator-0.2.18

toolhive-operator-0.2.19

toolhive-operator-0.2.2

toolhive-operator-0.2.20

toolhive-operator-0.2.21

toolhive-operator-0.2.22

toolhive-operator-0.2.23

toolhive-operator-0.2.24

toolhive-operator-0.2.25

toolhive-operator-0.2.26

toolhive-operator-0.2.3

toolhive-operator-0.2.4

toolhive-operator-0.2.5

toolhive-operator-0.2.6

toolhive-operator-0.2.8

toolhive-operator-0.3.0

toolhive-operator-0.3.1

toolhive-operator-0.3.2

toolhive-operator-0.3.4

toolhive-operator-0.3.5

toolhive-operator-0.3.6

toolhive-operator-0.3.7

toolhive-operator-0.4.0

toolhive-operator-0.5.0

toolhive-operator-0.5.1

toolhive-operator-0.5.10

toolhive-operator-0.5.11

toolhive-operator-0.5.12

toolhive-operator-0.5.13

toolhive-operator-0.5.14

toolhive-operator-0.5.15

toolhive-operator-0.5.16

toolhive-operator-0.5.17

toolhive-operator-0.5.18

toolhive-operator-0.5.19

toolhive-operator-0.5.2

toolhive-operator-0.5.20

toolhive-operator-0.5.21

toolhive-operator-0.5.22

toolhive-operator-0.5.23

toolhive-operator-0.5.24

toolhive-operator-0.5.25

toolhive-operator-0.5.26

toolhive-operator-0.5.27

toolhive-operator-0.5.28

toolhive-operator-0.5.3

toolhive-operator-0.5.4

toolhive-operator-0.5.5

toolhive-operator-0.5.6

toolhive-operator-0.5.7

toolhive-operator-0.5.8

toolhive-operator-0.5.9

toolhive-operator-crds-0.*

toolhive-operator-crds-0.0.10

toolhive-operator-crds-0.0.100

toolhive-operator-crds-0.0.101

toolhive-operator-crds-0.0.102

toolhive-operator-crds-0.0.103

toolhive-operator-crds-0.0.104

toolhive-operator-crds-0.0.105

toolhive-operator-crds-0.0.106

toolhive-operator-crds-0.0.11

toolhive-operator-crds-0.0.12

toolhive-operator-crds-0.0.13

toolhive-operator-crds-0.0.14

toolhive-operator-crds-0.0.15

toolhive-operator-crds-0.0.16

toolhive-operator-crds-0.0.17

toolhive-operator-crds-0.0.18

toolhive-operator-crds-0.0.19

toolhive-operator-crds-0.0.21

toolhive-operator-crds-0.0.22

toolhive-operator-crds-0.0.23

toolhive-operator-crds-0.0.24

toolhive-operator-crds-0.0.25

toolhive-operator-crds-0.0.26

toolhive-operator-crds-0.0.27

toolhive-operator-crds-0.0.29

toolhive-operator-crds-0.0.3

toolhive-operator-crds-0.0.30

toolhive-operator-crds-0.0.31

toolhive-operator-crds-0.0.32

toolhive-operator-crds-0.0.33

toolhive-operator-crds-0.0.34

toolhive-operator-crds-0.0.35

toolhive-operator-crds-0.0.36

toolhive-operator-crds-0.0.38

toolhive-operator-crds-0.0.39

toolhive-operator-crds-0.0.4

toolhive-operator-crds-0.0.40

toolhive-operator-crds-0.0.41

toolhive-operator-crds-0.0.42

toolhive-operator-crds-0.0.43

toolhive-operator-crds-0.0.44

toolhive-operator-crds-0.0.45

toolhive-operator-crds-0.0.46

toolhive-operator-crds-0.0.47

toolhive-operator-crds-0.0.48

toolhive-operator-crds-0.0.49

toolhive-operator-crds-0.0.5

toolhive-operator-crds-0.0.50

toolhive-operator-crds-0.0.51

toolhive-operator-crds-0.0.52

toolhive-operator-crds-0.0.53

toolhive-operator-crds-0.0.54

toolhive-operator-crds-0.0.55

toolhive-operator-crds-0.0.56

toolhive-operator-crds-0.0.57

toolhive-operator-crds-0.0.58

toolhive-operator-crds-0.0.59

toolhive-operator-crds-0.0.6

toolhive-operator-crds-0.0.60

toolhive-operator-crds-0.0.61

toolhive-operator-crds-0.0.62

toolhive-operator-crds-0.0.63

toolhive-operator-crds-0.0.64

toolhive-operator-crds-0.0.65

toolhive-operator-crds-0.0.66

toolhive-operator-crds-0.0.67

toolhive-operator-crds-0.0.68

toolhive-operator-crds-0.0.69

toolhive-operator-crds-0.0.7

toolhive-operator-crds-0.0.70

toolhive-operator-crds-0.0.71

toolhive-operator-crds-0.0.72

toolhive-operator-crds-0.0.73

toolhive-operator-crds-0.0.74

toolhive-operator-crds-0.0.75

toolhive-operator-crds-0.0.76

toolhive-operator-crds-0.0.77

toolhive-operator-crds-0.0.78

toolhive-operator-crds-0.0.79

toolhive-operator-crds-0.0.8

toolhive-operator-crds-0.0.80

toolhive-operator-crds-0.0.81

toolhive-operator-crds-0.0.82

toolhive-operator-crds-0.0.83

toolhive-operator-crds-0.0.84

toolhive-operator-crds-0.0.85

toolhive-operator-crds-0.0.86

toolhive-operator-crds-0.0.88

toolhive-operator-crds-0.0.89

toolhive-operator-crds-0.0.9

toolhive-operator-crds-0.0.90

toolhive-operator-crds-0.0.91

toolhive-operator-crds-0.0.92

toolhive-operator-crds-0.0.93

toolhive-operator-crds-0.0.94

toolhive-operator-crds-0.0.95

toolhive-operator-crds-0.0.96

toolhive-operator-crds-0.0.97

toolhive-operator-crds-0.0.98

toolhive-operator-crds-0.0.99

v0.*

v0.0.1

v0.0.10

v0.0.11

v0.0.12

v0.0.13

v0.0.14

v0.0.15

v0.0.16

v0.0.17

v0.0.18

v0.0.19

v0.0.2

v0.0.20

v0.0.21

v0.0.22

v0.0.23

v0.0.24

v0.0.25

v0.0.26

v0.0.27

v0.0.28

v0.0.29

v0.0.3

v0.0.30

v0.0.31

v0.0.32

v0.0.33

v0.0.34

v0.0.35

v0.0.36

v0.0.37

v0.0.38

v0.0.39

v0.0.4

v0.0.40

v0.0.41

v0.0.42

v0.0.43

v0.0.44

v0.0.45

v0.0.46

v0.0.47

v0.0.48

v0.0.5

v0.0.6

v0.0.7

v0.0.8

v0.0.9

v0.1.0

v0.1.1

v0.1.2

v0.1.3

v0.1.4

v0.1.5

v0.1.6

v0.1.7

v0.1.8

v0.1.9

v0.10.0

v0.10.1

v0.10.2

v0.11.0

v0.11.1

v0.11.2

v0.11.3

v0.12.0

v0.12.1

v0.12.2

v0.12.3

v0.12.4

v0.12.5

v0.13.0

v0.13.1

v0.14.0

v0.14.1

v0.15.0

v0.16.0

v0.17.0

v0.18.0

v0.19.0

v0.2.0

v0.2.1

v0.2.10

v0.2.11

v0.2.12

v0.2.13

v0.2.14

v0.2.15

v0.2.16

v0.2.17

v0.2.2

v0.2.3

v0.2.4

v0.2.5

v0.2.6

v0.2.7

v0.2.8

v0.2.9

v0.20.0

v0.21.0

v0.22.0

v0.23.0

v0.23.1

v0.24.0

v0.24.1

v0.25.0

v0.26.0

v0.26.1

v0.27.0

v0.27.1

v0.27.2

v0.28.0

v0.28.1

v0.28.2

v0.28.3

v0.29.0

v0.29.1

v0.29.2

v0.29.3

v0.3.0

v0.3.1

v0.3.10

v0.3.11

v0.3.2

v0.3.3

v0.3.4

v0.3.5

v0.3.6

v0.3.7

v0.3.8

v0.3.9

v0.30.0

v0.30.1

v0.4.0

v0.4.1

v0.4.2

v0.5.0

v0.5.1

v0.5.2

v0.6.0

v0.6.1

v0.6.10

v0.6.11

v0.6.12

v0.6.13

v0.6.14

v0.6.15

v0.6.16

v0.6.17

v0.6.2

v0.6.3

v0.6.4

v0.6.5

v0.6.6

v0.6.7

v0.6.8

v0.6.9

v0.7.0

v0.7.1

v0.7.2

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.9.0

v0.9.1

v0.9.2

v0.9.3

v0.9.4

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58196.json"