CVE-2026-67542

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Source

https://cve.org/CVERecord?id=CVE-2026-67542

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67542.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-67542

Aliases

GHSA-jjvx-3wfc-p8hq

Published

2026-11-11T21:39:24Z

Modified

2026-11-13T02:47:36Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N CVSS Calculator

Summary

Heym: SSRF via POST /api/mcp/fetch-tools: any authenticated user reaches local/private URLs through the SSE and streamable-HTTP transports

Details

Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to version 0.0.70, POST /api/mcp/fetch-tools is reachable by any authenticated user (lowest role; no admin/workflow association) and fetches an attacker-supplied URL through the sse and streamable_http transports with no scheme / private-IP / allowlist / redirect guard. The transport error is reflected in the HTTP 422 response, giving a semi-blind SSRF oracle, and the attacker also controls the outbound request headers. This issue has been patched in version 0.0.70.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67542.json"
}

References

Affected packages

Git / github.com/heymrun/heym

Affected ranges

Type

GIT

Repo

https://github.com/heymrun/heym

Events

Introduced

Fixed

b67e9efb6623385125347b2610e422d18f1c82fa

Fixed

72954f1f6264f6260bc1148b09ca10d613992b64

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.0.70"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "72954f1f6264f6260bc1148b09ca10d613992b64"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "0.0.70",
            "range": [
                {
                    "fixed": "b67e9efb6623385125347b2610e422d18f1c82fa"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v.*

v.0.0.49

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

v0.0.29

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

v0.0.50

v0.0.51

v0.0.52

v0.0.53

v0.0.54

v0.0.55

v0.0.56

v0.0.57

v0.0.58

v0.0.6

v0.0.7

v0.0.8

v0.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67542.json"