CVE-2026-9198
IBM Langflow Code Injection Vulnerability
IBM Langflow
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
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 4 August 2026. US federal agencies were required to remediate it by 7 August 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 17.1%, which is higher than 96.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2026-9198 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-9198.
What does CVE-2026-9198 affect?
CVE-2026-9198 affects IBM Langflow. 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
How severe is CVE-2026-9198?
CVE-2026-9198 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 17.1%, higher than 96.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 7 August 2026.
How should organisations respond to CVE-2026-9198?
Apply the vendor patch for IBM Langflow as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.