Is there a public exploit for CVE-2026-67542?

No public exploit for CVE-2026-67542 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-67542?

CVE-2026-67542 scores CVSS 7.1 (v3.1), rated high.

What does CVE-2026-67542 affect?

CVE-2026-67542 affects heymrun heym.

7.1 High

Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure.

CVE-2026-67542

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 streamablehttp 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.

Assessment

CVSS: 7.1 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 11 November 2026
Last updated: 12 November 2026
Affected: heymrun · heym
Assigner: GitHub_M

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

At the source

EUVD (ENISA)

References

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