CVE-2026-9198: IBM Langflow Code Injection Vulnerability

In short

IBM Langflow has a weakness classified as code injection (CWE-94). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-04. NVD lists CVSS 3.1 at 9.8 CRITICAL.

What it is

“Langflow contains a code injection vulnerability that allows unauthenticated attackers to achieve full remote code execution on default Langflow deployments.” — CISA KEV, retrieved 2026-11-01

“IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to chain /api/v1/auto_login (mints SUPERUSER tokens to any network caller) with /api/v1/validate/code (executes user code via exec()) to achieve full RCE on default Langflow deployments” — NVD, retrieved 2026-11-01

Who is affected

IBM Langflow. NVD lists the following versions as affected:

• Versions from 1.0.0 inclusive, before 1.10.1

Exploitation status

CISA KEV added: 2026-08-04. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-08-07.

Scores

NVD CVSS 3.1: 9.8 CRITICAL; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source [email protected].

EPSS by FIRST: 28.66%; percentile 98.14; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-94.

Timeline

CISA required action

“Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.” — CISA KEV

What to do

• Confirm whether you run IBM Langflow and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Vendor Advisory: https://www.ibm.com/support/pages/node/7278927
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.