# CVE-2026-81941 — IBM Langflow OSS

> As of 2026-09-12, CVE-2026-81941 is a HIGH-severity vulnerability in IBM Langflow OSS, CVSS v3.1 8.8, EPSS 0.8% (54.5th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-81941 as of 2026-09-12; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-12

## What is CVE-2026-81941?

IBM Langflow OSS 1.0.0 through 1.11.5 allows an authenticated non-administrative user could execute arbitrary operating system commands on the server at the privilege level of the application process by constructing a flow with an MCP Tools component configured to use a local stdio subprocess transport. This bypasses both the LANGFLOW_CUSTOM_COMPONENT_ADMIN_ONLY and LANGFLOW_BLOCK_CODE_INTERPRETER_COMPONENTS server-side controls intended to prevent exactly this class of access. Successful exploitation could lead to arbitrary command execution, sensitive data exposure (including credentials from the process environment), file system modification, and lateral movement to services reachable from the server.

The record classifies CVE-2026-81941 under weakness class [CWE-284](https://intel.threadlinqs.com/cwe/CWE-284). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 25 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.8% probability of exploitation in the next 30 days, higher than 54.5% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-10, last modified 2026-09-12

## Is CVE-2026-81941 being exploited?

It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [IBM](https://intel.threadlinqs.com/vendors/ibm): Langflow OSS

## How to fix CVE-2026-81941

No vendor patch reference has been recorded for CVE-2026-81941 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-81941

No threat campaign in the Threadlinqs corpus currently references CVE-2026-81941, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-09-13.

**Vendor advisory and patch**

- [ibm.com — vendor advisory](https://www.ibm.com/support/pages/node/7286666)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-81941
Full detection coverage and IOCs for threats exploiting CVE-2026-81941 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp