CVE-2026-55446: CWE-400: Uncontrolled Resource Consumption in langflow-ai langflow
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.
AI Analysis
Technical Summary
CVE-2026-55446 is a high-severity vulnerability in langflow (prior to version 1.0.19) where an attacker can exploit the /api/v1/files/upload/ endpoint without authentication by sending a multipart form request with an excessively long boundary string. This triggers uncontrolled resource consumption (CWE-400), resulting in a denial-of-service condition that makes the langflow application unavailable to all users indefinitely. The vulnerability is resolved in langflow version 1.0.19.
Potential Impact
Successful exploitation leads to a denial-of-service condition, rendering the langflow application unusable for an indefinite period. There is no confidentiality or integrity impact reported. The vulnerability can be triggered remotely without authentication.
Mitigation Recommendations
Upgrade langflow to version 1.0.19 or later, where this vulnerability is fixed. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor stating the fix in 1.0.19.
CVE-2026-55446: CWE-400: Uncontrolled Resource Consumption in langflow-ai langflow
Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/langflow-ai/langflowRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55446 is a high-severity vulnerability in langflow (prior to version 1.0.19) where an attacker can exploit the /api/v1/files/upload/ endpoint without authentication by sending a multipart form request with an excessively long boundary string. This triggers uncontrolled resource consumption (CWE-400), resulting in a denial-of-service condition that makes the langflow application unavailable to all users indefinitely. The vulnerability is resolved in langflow version 1.0.19.
Potential Impact
Successful exploitation leads to a denial-of-service condition, rendering the langflow application unusable for an indefinite period. There is no confidentiality or integrity impact reported. The vulnerability can be triggered remotely without authentication.
Mitigation Recommendations
Upgrade langflow to version 1.0.19 or later, where this vulnerability is fixed. No other mitigation or workaround is indicated. Patch status is confirmed by the vendor stating the fix in 1.0.19.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T21:59:57.018Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3ab6daeed863c81e4f9f25
Added to database: 06/23/2026, 16:39:54 UTC
Last enriched: 06/23/2026, 16:54:21 UTC
Last updated: 08/07/2026, 00:41:15 UTC
Views: 49
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