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  4. CVE 2026 67542 heym ssrf via post apimcpfetch tools any
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Back to active CVEs
High · CVSS 7.1CVE-2026-67542

Heym: SSRF via POST /api/mcp/fetch-tools: any authenticated user reaches local/private URLs through the SSE and streamable-HTTP transportsCVE-2026-67542

Answer in brief

CVE-2026-67542 records a High severity (CVSS 7.1) vulnerability in Heym: SSRF via POST /api/mcp/fetch-tools: any authenticated user reaches local/private URLs through the SSE and streamable-HTTP transports. The current sources do not mark it as known exploited. The current feed maps heymrun/heym (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 11, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps heymrun/heym (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
heymrun/heymgeneric<0.0.700.0.70

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for heymrun/heym.
  2. 2Review the reported fix. Update heymrun/heym to 0.0.70 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Heym - Horizontal IDOR: get-by-id on workflow/node templates skips the visibility check the list path enforcesSame heymrun/heym package
  • Heym: Missing role gate in team-member management lets any member add/remove members, exposing team-shared credentialsSame heymrun/heym package
  • Heym Unsandboxed skill code execution: skills run via a local backend subprocess without the Docker isolation that Python tools mandateSame heymrun/heym package
  • Heym: Playwright Custom Code Backend RCE via `playwrightCode` FieldSame heymrun/heym package
  • Heym: Server-Side Request Forgery (SSRF) in HTTP Workflow NodeSame heymrun/heym package
  • Heym: Command execution via POST /api/mcp/fetch-tools stdio transport: supplied command is spawned before MCP validationSame heymrun/heym package

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Nov 11, 2026
References
3 linked sources
Open source record