Vulnerability intelligence
CVE-2026-55450
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.
CVSS Score
9.3
Critical
EPSS — Exploit Probability
6.4%
Riskier than 93% of all CVEs
Exploitation
Not in CISA KEV
No federal exploitation record
Remediation
Patch available
Vendor fix published
2 articles across 1 outlet · first covered Jun 19, 2026 · latest Jun 26, 2026
Coverage timeline
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Critical flaws in Langflow allow data theft and DoS, patch urgedsecurityonline.info · Jun 26, 2026
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Langflow File Upload Flaw: Details and PoC Exploit Publicly Disclosed (CVE-2026-55450)securityonline.info · Jun 19, 2026