CVE-2026-19297 is a critical vulnerability in IBM Langflow OSS affecting versions 1.0.0 through 1.9.6. It involves CWE-307, improper restriction of excessive authentication attempts, which can enable remote attackers to bypass authentication controls and gain unauthorized access to user accounts. The vulnerability has a CVSS 3.1 base score of 9.1, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality and integrity. No vendor advisory or patch information is currently available, and no known exploits are reported in the wild.

An attacker can remotely exploit this vulnerability to gain unauthorized access to user accounts, potentially compromising sensitive information and system integrity. The vulnerability does not affect availability. The critical CVSS score indicates a severe risk to confidentiality and integrity of affected systems.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider implementing compensating controls such as rate limiting authentication attempts or additional monitoring where feasible.