# CVE-2026-9198 — IBM Langflow OSS

**CISA KEV**

> As of 2026-08-17, CVE-2026-9198 is a CRITICAL-severity vulnerability in IBM Langflow OSS, CVSS v3.1 9.8, EPSS 28.6% (98.0th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-04), with a US federal remediation deadline of 2026-08-07. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-9198, most recently “CVE-2026-9198 — Unauthenticated RCE in IBM Langflow Under Active Exploitation (Auto-Login Bypass + Code Injection Chain)”.

**Last updated:** 2026-08-17

## What is CVE-2026-9198?

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

The record classifies CVE-2026-9198 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 no prior authentication, 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:** 9.8 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 28.6% probability of exploitation in the next 30 days, higher than 98.0% of all scored CVEs
- **CISA KEV:** Listed since 2026-08-04, federal remediation deadline 2026-08-07
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2026-07-17, last modified 2026-08-17

## Is CVE-2026-9198 being exploited?

CISA added CVE-2026-9198 to the Known Exploited Vulnerabilities catalog on 2026-08-04, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-08-07 under BOD 22-01. Weaponised exploit code for CVE-2026-9198 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (`http/cves/2026/CVE-2026-9198.yaml`). It currently carries a trending score of 58 in the Threadlinqs vulnerability feed.

- [0xgh057r3c0n/CVE-2026-9198](https://github.com/0xgh057r3c0n/CVE-2026-9198) (github)
- [0xdak/CVE-2026-9198_exploit](https://github.com/0xdak/CVE-2026-9198_exploit) (github)
- [rmhowe425/PoC-CVE-2026-9198](https://github.com/rmhowe425/PoC-CVE-2026-9198) (github)
- [ywh-jfellus/CVE-2026-9198](https://github.com/ywh-jfellus/CVE-2026-9198) (github)
- [Procjevt/CVE-2026-9198](https://github.com/Procjevt/CVE-2026-9198) (github)
- [CuteeCat/CVE-2026-9198](https://github.com/CuteeCat/CVE-2026-9198) (github)
- [chessalekin/cve-2026-9198_exploit](https://github.com/chessalekin/cve-2026-9198_exploit) (github)
- [joaovicdev/EXPLOIT-CVE-2026-9198](https://github.com/joaovicdev/EXPLOIT-CVE-2026-9198) (github)

## Affected products and versions

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

## How to fix CVE-2026-9198

Because CVE-2026-9198 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-08-07. No vendor patch reference has been recorded for CVE-2026-9198 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-2026-9198

1 tracked threat in the Threadlinqs corpus references CVE-2026-9198, 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, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [ibm.com — vendor advisory](https://www.ibm.com/support/pages/node/7278927)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-9198
Full detection coverage and IOCs for threats exploiting CVE-2026-9198 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp