CVE-2026-9198 CISA KEV — actively exploited

IBM Langflow Code Injection Vulnerability

IBM — Langflow OSS

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

CVSS scoreCritical

9.8

EPSS — exploitation probabilityMedium

17.4%

Vector breakdown

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published: Jul 17, 2026
Modified: Aug 17, 2026
Added to KEV: Aug 4, 2026
Federal patch due: Aug 7, 2026

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.

Weakness classification

CWE-94Improper Control of Generation of Code

Affected packages

unknown packageunknown

GHSA-5wm9-vgmg-cjv6

Proof-of-concept & exploitation references

8 found

Weaponization

Nuclei template

Available

Metasploit module

Not found

Public repositories whose name or description references CVE-2026-9198, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.

References

Frequently asked questions

What is CVE-2026-9198?

How severe is CVE-2026-9198?

CVE-2026-9198 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).

Is CVE-2026-9198 actively exploited in the wild?

Yes. CVE-2026-9198 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Aug 4, 2026, meaning CISA has confirmed evidence of active exploitation.

What is the EPSS score for CVE-2026-9198?

17.4% - meaning FIRST.org's EPSS model estimates a 17.4% probability this vulnerability will be exploited in the wild within 30 days (97% percentile among all scored CVEs).

Is there exploit tooling available for CVE-2026-9198?

Yes - a public Nuclei template referencing CVE-2026-9198 exist in public repositories we checked. We also found 8 public GitHub repositories referencing this CVE.

What type of vulnerability is CVE-2026-9198?

CVE-2026-9198 is classified under CWE-94 (CWE-94 Improper Control of Generation of Code ('Code Injection')).

Cross-checked against

Impactr finds and proves whether CVE-2026-9198 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.

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