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Back to active CVEs
High · CVSS 8.4CVE-2026-55786GHSA-H9F9-H6GM-WC85

Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`CVE-2026-55786

Answer in brief

CVE-2026-55786 records a High severity (CVSS 8.4) vulnerability in Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`. The current sources do not mark it as known exploited. The current feed maps flytohub/flyto-core (generic), flyto-core (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Oct 14, 2026Updated Oct 14, 2026Source checked Oct 14, 2026First seen by HOL Jul 6, 2026Material review Oct 14, 2026
Upstream Advisory

Record context

Vulnerability class
Command Injection
EPSS
Not reported
CWE IDs
CWE-78, CWE-306
Source
CVE List V5
Source checked
Oct 14, 2026
References
6 linked sources
Open source record

Key facts

Risk
High · CVSS 8.4
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.4. 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 flytohub/flyto-core (generic), flyto-core (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
flytohub/flyto-coregeneric>=2.26.2 <2.26.42.26.4
flyto-corepip>=2.26.2,<2.26.42.26.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for flytohub/flyto-core, flyto-core.
  2. 2Review the reported fix. Update flytohub/flyto-core to 2.26.4; flyto-core to 2.26.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 14, 2026

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

  2. Source modified

    Oct 14, 2026

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

  3. First seen by HOL

    Jul 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
Upstream source description

Flyto2 Core is an execution kernel for automation and AI-agent workflows. From 2.26.2 until 2.26.4, the HTTP MCP POST /mcp route accepts unauthenticated JSON-RPC tools/call requests and forwards execute_module arguments to the module registry without the require_auth dependency used by the REST execution routes. An unauthenticated caller can select sandbox.execute_shell and supply its command parameter, which reaches asyncio.create_subprocess_shell with the privileges of the flyto-core server process. The endpoint is reachable locally under the default loopback binding and becomes network reachable when an operator binds the server to a non-loopback interface, allowing arbitrary OS command execution and potential full host compromise. This issue is fixed in version 2.26.4.

Quoted source text, attributed separately from HOL analysis.

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  • PAN-OS: Denial of Service (DoS) Vulnerabilities in Network ServicesSame generic ecosystem
  • BentoPDF: SSRF via DNS Rebinding (TOCTOU) in Cloudflare CORS Proxy WorkerSame generic ecosystem
  • CRLF header injection in vertx-mail-client allows manipulation of outgoing SMTP messagesSame generic ecosystem