# CVE-2026-9198: IBM Langflow Code Injection Vulnerability

- Exploited (CISA KEV): yes, added 2026-08-04
- Published: 2026-07-17
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 28.7% (98th percentile)
- CWE: CWE-94

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

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2026-09-16 | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2026-09-16 · updated · rule 200204017
  > Updated: signature 200204017 "Langflow Code Injection" (Server Side Code Injection, risk High), systems: Python. References: CVE-2025-3248, CVE-2026-9198, CVE-2026-0768.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2026-10-21 · updated · rule 200204017
  > Updated: signature 200204017 "Langflow Code Injection" (Server Side Code Injection, risk High), systems: Python. References: CVE-2025-3248, CVE-2026-9198, CVE-2026-0768, CVE-2026-93674.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: partial (1 of 2 requests blocked), template CVE-2026-9198, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (1 of 2 requests blocked), template CVE-2026-9198, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-9198 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-9198