🔍 VULNERABILITY EXPOSURE ASSESSMENT
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Executive Summary
IBM Langflow OSS versions 1.0.0 through 1.11.1 contain a critical authenticated remote‑code execution flaw (CVE‑2026‑19295) that permits an attacker to run arbitrary operating‑system commands in the server process. Organizations that have deployed Langflow OSS in production environments are directly exposed to privilege escalation and full system compromise. Immediate board‑level decision is required to approve emergency patching or enforce a temporary mitigation (e.g., disabling flow creation) to contain the risk.
Verified Facts
- CVE‑2026‑19295 exists in IBM Langflow OSS 1.0.0 through 1.11.1 — NVD record.
- The vulnerability allows an authenticated attacker to execute arbitrary OS commands by saving a flow with a crafted type field and triggering a wrapper‑flow build — NVD record.
- Exploitation bypasses the LANGFLOW_ALLOW_CUSTOM_COMPONENTS=false policy control — NVD record.
- CVSS 3.1 base score is 9.9 with vector AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H — NVD record.
- The vulnerability is classified under CWE‑95 (Improper Neutralization of Directives in Dynamically Evaluated Code) — NVD record.
Threat Classification
Threat type: Authenticated remote‑code execution leading to privilege escalation (HIGH CONFIDENCE). Affected sectors: Any industry deploying Langflow OSS for AI/ML workflow orchestration, notably technology, finance, and healthcare (MEDIUM CONFIDENCE). Geographic scope: Global, as the open‑source project is publicly available (MEDIUM CONFIDENCE). Exploitation status: Publicly disclosed with no confirmed active exploitation in the wild (MEDIUM CONFIDENCE). Attacker motivation: Not stated in the source (LOW CONFIDENCE).
Threat Severity Assessment
- Exploitability – requires only authentication and network access, low complexity (HIGH CONFIDENCE).
- Impact – full OS command execution under server identity, complete confidentiality, integrity, and availability compromise (HIGH CONFIDENCE).
- Prevalence – affects all deployments of Langflow OSS 1.0.0‑1.11.1, a widely used OSS component (MEDIUM CONFIDENCE).
- CVSS score of 9.9 places the vulnerability in the CRITICAL tier (HIGH CONFIDENCE).
Business Impact
Operational disruption: An attacker can shut down or reconfigure critical services by issuing OS commands, leading to immediate production downtime. Regulatory liability: If the compromised host processes personal data, GDPR fines of up to €20 million or 4 % of global turnover may be triggered; NIS2‑covered entities could face enforcement actions for inadequate security controls. Financial exposure: High‑impact breach scenarios can generate multi‑million‑dollar incident response and remediation costs. Reputational damage: Public disclosure of a successful exploit against a flagship AI workflow platform can erode customer trust and market confidence.
Technical Analysis
- Attack vector: Network‑based request to Langflow OSS API (authenticated) – CVSS AV:N.
- Exploitation chain: Authenticated user → Save flow with malicious type field → Trigger wrapper‑flow build → Server process evaluates field and executes OS command.
- Affected component: Flow‑type parsing and wrapper‑flow builder in Langflow OSS versions 1.0.0‑1.11.1.
- Root cause: Improper neutralization of directives in dynamically evaluated code (CWE‑95).
- Authentication requirement: Low (any valid Langflow user account) – CVSS PR:L.
- Policy bypass: LANGFLOW_ALLOW_CUSTOM_COMPONENTS=false is ignored during exploitation.
- Impact scope: Command execution runs with the same privileges as the Langflow server process, typically root or service account.
CVE Analysis
- CVE‑2026‑19295 – IBM Langflow OSS 1.0.0‑1.11.1 – CWE‑95 Improper Neutralization of Directives in Dynamically Evaluated Code – Network (AV:N), Low authentication (PR:L) – Patch status not disclosed in the article.
MITRE ATT&CK Mapping
- Execution → T1059.003: Windows Command Shell — the vulnerability enables arbitrary OS command execution via the Langflow server process.
- Privilege Escalation → T1068: Exploitation for Privilege Escalation — the attacker escalates from an authenticated flow user to full OS‑level privileges.
IOC Intelligence
No public IOCs confirmed at time of publication.
Behavioral IOC categories for rule creation:
- Creation of a Langflow flow object containing a crafted type field with command‑injection patterns.
- Invocation of the wrapper‑flow build endpoint immediately after a flow with a suspicious type field is saved.
- Unexpected OS command execution events logged by the Langflow service process (e.g., “cmd.exe /c …” on Windows or “/bin/sh -c …” on Linux).
- Process creation telemetry showing the Langflow binary spawning a child process with elevated privileges.
Detection Engineering Guidance
- Application logs – monitor Langflow API calls to /flows or /wrapper‑build endpoints; flag requests where the type parameter matches regex .*[;|&].* indicating command injection.
- Web server access logs – correlate POST requests from authenticated users that include a type field payload exceeding normal length thresholds.
- Sysmon Event ID 1 (Process Create) – alert on processes launched by the Langflow service executable where the command line contains typical shell operators (e.g., “;”, “&&”, “|”).
- Windows Security Event ID 4688 – detect child processes spawned by the Langflow service account with command‑line arguments that differ from known legitimate commands.
- Linux auditd – watch for execve syscalls originating from the Langflow binary with unexpected arguments.
Sigma Rules
title: Langflow Suspicious Flow Type Command Injection
id: 3f9c2d1e-8b4a-4f6e-9a2d-1c7e5b9f6a3b
status: stable
description: Detects creation of a Langflow flow with a crafted type field that contains command‑injection characters, indicating exploitation of CVE‑2026‑19295.
author: CYBERDUDEBIVASH Sentinel APEX
logsource:
product: webserver
service: http
detection:
selection:
uri: '/api/flows'
http_method: POST
request_body|contains:
- ';'
- '&&'
- '|'
condition: selection
falsepositives:
- Legitimate admin scripts that use complex type strings
level: high
tags:
- attack.execution
- attack.t1059.003
Threat Hunting Queries
- Hypothesis: Attackers have saved flows with malicious type fields – Source: Langflow application logs – Query: `select * from logs where message like '%type=%' and message like '%;%'`.
- Hypothesis: Wrapper‑flow builds are triggered immediately after suspicious flow creation
Hypothesis: If CVE-2026-19295 is deployed and reachable as described by CDB-CTI-2026-8C3A824BBA52's evidence (CVE: CVE-2026-19295), telemetry consistent with the vulnerability class below may show attempted or successful exploitation.
Success criteria: A specific, timestamped, corroborated telemetry match consistent with the vulnerability class, tied to the confirmed affected component.
Escalation criteria: Escalate to incident response only when a validated telemetry match is corroborated by at least one additional independent signal (e.g. an authentication anomaly or unexpected process lineage) -- a single matching log line alone is not sufficient grounds for escalation.
Confidence: MEDIUM — Maturity: PROPOSED (not independently confirmed by execution against real telemetry)
Limitations: Derived from the vulnerability class alone; does not confirm the affected component is actually deployed in the reader's environment, nor that matching telemetry represents genuine exploitation rather than benign activity.
T1068 — Exploitation for Privilege Escalation (privilege-escalation)
STATUS: CONDITIONAL · CONFIDENCE: MEDIUM
Privilege Escalation → Exploitation for Privilege Escalation (T1068), conditional on observed elevation.
Limitation: Conditional on the deployment/exploitation scenario described in the source record; not confirmed by telemetry.
Limitations: Reflects only this record's own reported exploitation and patch status; does not confirm whether the affected component is deployed in any specific environment.
Limitations: Detection guidance is evidence-scoped to this record; does not confirm the described technique has been observed in any specific environment.
nvd
Source Reliability: B
Information Credibility: 3 (Possibly True)
Overall Analytical Confidence: MEDIUM
Reported by a single identified source; an independent second source has not been found (see the evidence ledger).
Would be resolved by: A second, independent source reporting the same underlying fact.
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