External risk intelligence

IBM Langflow OSS Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-85025

The vulnerability affects Langflow endpoints explicitly designed to be publicly shared. Because these endpoints are intended for public access by design to facilitate project sharing, they are inherently exposed to the internet in common deployment patterns.

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory addresses a critical vulnerability in IBM Langflow's open-source software, specifically concerning its handling of publicly shared project endpoints. The issue allows unauthorized individuals to potentially execute their own code and interfere with chat sessions due to weaknesses in security and session controls. At a high level, this means an external attacker could gain control over certain functionalities within the affected software.

  • Unauthorized code execution risk in shared projects.
  • Impacts public sharing features of Langflow.
  • Confirm relevance and exposure for security review.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker could exploit this vulnerability by targeting publicly shared Langflow project endpoints. By bypassing security restrictions and session isolation, the attacker could execute arbitrary code, leading to unauthorized access or modification of chat session data.

  • Publicly accessible project endpoints.
  • Improper security enforcement.
  • Arbitrary code execution and data compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary code when interacting with publicly shared project endpoints. This could lead to unauthorized access to or modification of chat session data.

  • Chat session data and system commands.
  • Via exposed project endpoints.
  • Code execution and data manipulation.

Operational Fix

Recommended remediation, mitigation, and detection steps

IBM Langflow OSS, particularly its publicly shared project endpoints, is likely managed by application owners and platform teams responsible for the underlying infrastructure. The immediate priority is to identify all instances of the affected technology, confirm their exposure and criticality, and then assign ownership for remediation planning.

  • Application and platform teams should own this.
  • Verify public endpoint reachability and criticality first.
  • Plan remediation based on identified risk.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is IBM Langflow OSS?

IBM Langflow OSS is a visual framework used for building and managing generative AI workflows and LLM-based applications. It allows users to create complex data flows, integrate various tools, and share projects via web endpoints. The vulnerability specifically affects components within the software that handle these shared project spaces and the underlying session management logic.

What is the vulnerability in CVE-2026-85025?

This vulnerability is classified as CWE-863, which refers to incorrect authorization. Essentially, the software fails to properly verify if a user has permission to perform specific actions. Because of this, an unauthenticated attacker can bypass security restrictions intended to keep chat sessions isolated, allowing them to interact with or modify data they should not have access to.

How does an attacker trigger this CVE-2026-85025 flaw?

An attacker triggers this vulnerability by targeting publicly shared project endpoints within the Langflow application. The flaw does not require the attacker to have an existing account or password, as it stems from improper enforcement of security controls. Private flows that are not shared or exposed via these specific project endpoints are not the primary target of this mechanism.

Is my Langflow deployment at risk?

According to Halo Surface Signal, this vulnerability is very likely to impact you if your Langflow endpoints are designed to be shared publicly. Because these endpoints are often intended for internet-facing access by design, they fall outside the protection of internal network boundaries. You should assume that any Langflow instance configured with public project sharing enabled is reachable by external actors.

How do I secure my systems against CVE-2026-85025?

Begin by auditing your infrastructure to locate all instances of Langflow OSS. Prioritize identifying which instances have publicly shared project endpoints enabled, as these are the most exposed. Once identified, consult official IBM support resources to understand the latest version requirements or configuration changes needed to restore proper session isolation and security enforcement.

References