# CVE-2026-8481 — IBM Langflow OSS

> As of 2026-07-23, CVE-2026-8481 is a CRITICAL-severity vulnerability in IBM Langflow OSS, CVSS v3.1 9.9, EPSS 0.8% (57.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-8481, most recently “CVE-2026-9198 — Unauthenticated RCE in IBM Langflow Under Active Exploitation (Auto-Login Bypass + Code Injection Chain)”.

**Last updated:** 2026-07-23

## What is CVE-2026-8481?

IBM Langflow OSS 1.0.0 through 1.10.0 contain a critical remote code execution vulnerability in the code validation API endpoint. The POST /api/v1/validate/code endpoint accepts user-supplied Python code and executes it directly using Python's built-in exec() function without sandboxing, input validation, or privilege restrictions, enabling any authenticated user to execute arbitrary system commands with the full privileges of the Langflow server process.

The record classifies CVE-2026-8481 under weakness class [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). 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 96 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.9 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.8% probability of exploitation in the next 30 days, higher than 57.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-17, last modified 2026-07-23

## Is CVE-2026-8481 being exploited?

It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.

## Affected products and versions

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

## How to fix CVE-2026-8481

No vendor patch reference has been recorded for CVE-2026-8481 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-2026-8481

1 tracked threat in the Threadlinqs corpus references CVE-2026-8481, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-9198 — Unauthenticated RCE in IBM Langflow Under Active Exploitation (Auto-Login Bypass + Code Injection Chain)](https://intel.threadlinqs.com/threat/TL-2026-1893) — CRITICAL · 2026-08-05

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [ibm.com — vendor advisory](https://www.ibm.com/support/pages/node/7278923)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-8481
Full detection coverage and IOCs for threats exploiting CVE-2026-8481 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp