CVE-2026-55786

Flyto2 Core: Unauthenticated Command Execution via HTTP MCP `execute_module`

CVSS score

8.4

EPSS probability

%0.3

Risk score

0.0

Published

4 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

CVE-2026-55786: Unauthenticated Command Execution in Flyto2 Core

Sources read

Source agreement

Tam uyum

Evidence confidence

%86

Short explanation

The HTTP MCP endpoint in Flyto2 Core versions 2.26.2 through 2.26.4 accepts unauthenticated requests and forwards them to the module registry, enabling command execution with server process privileges.

Why does it matter?

This unauthenticated vulnerability allows attackers to execute arbitrary operating system commands either locally or over the network, potentially leading to full host compromise.

What should be done?

Upgrade flyto-core to version 2.26.4 or above
Follow the vendor advisory for specific upgrade instructions

Chain of evidence and sources2 verified claims

Flyto2 Core 2.26.2 ile 2.26.4 sürümleri arasındaki HTTP MCP POST /mcp rotası kimlik doğrulaması olmadan istekleri kabul eder.

S0 · daybreach-canonical

Bu güvenlik açığı 2.26.4 sürümünde giderilmiştir.

S0 · daybreach-canonical

Show the technical text from the sources

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.

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

CWE: CWE-78, CWE-306, CWE-937, CWE-1035

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-55786 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	flytohub	flyto-core	View
2	pypi	flyto-core	View
3	pypi	flyto-core	View
4	pypi	flyto-core	View

Total affected vendors: 2|Products: 4

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.4	CVSS 3.x	—	Vector not published	GitHub Advisory
8.4	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD
8.4	CVSS V3_1	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CVE CNA
0.0	CVSS 4.0	—	Vector not published	GitHub Advisory

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

osvflyto-core2.26.4

OSV düzeltilmiş sürüm: 2.26.4

gitlabpypi/flyto-core2.26.4

GitLab Advisory düzeltilmiş sürüm: 2.26.4

gitlab

Upgrade to version 2.26.4 or above.

canonical

Upgrade to version 2.26.4 or above.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-55786 is associated with the following CWEs:

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')CWE-306: Common Weakness Enumeration Entry CWE-306 CWE-937: Common Weakness Enumeration Entry CWE-937 CWE-1035: Common Weakness Enumeration Entry CWE-1035

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-55786 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

https://github.com/flytohub/flyto-core/security/advisories/GHSA-h9f9-h6gm-wc85vendor-advisory https://github.com/flytohub/flyto-core/commit/db7f116b1d3c5dcf94aded00d14118f81f3e225evendor-advisory https://github.com/flytohub/flyto-core/releases/tag/v2.26.4vendor-advisory https://nvd.nist.gov/vuln/detail/CVE-2026-55786vendor-advisory https://github.com/pypa/advisory-database/tree/main/vulns/flyto-core/PYSEC-2026-2482.yamlvendor-advisory https://github.com/advisories/GHSA-h9f9-h6gm-wc85vendor-advisory https://github.com/flytohub/flyto-corevendor-advisory https://pypi.org/project/flyto-corevendor-advisory

CVSS Vector Radar Chart

8.4 / 10

Vulnerability Scoring Details

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

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

flytohub

pypi

Weakness Type (CWE & CAPEC)

CWE-78 CWE-306 CWE-937 CWE-1035

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