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TI-2026-40015 Aliases CVE-2026-55450GHSA-x223-p2gf-v735

Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

Priority HIGH 79CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure, Security bypass, Denial of service
Confidentiality · integrity · availability
Low · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200, CWE-306 and CWE-400.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0119 68th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed langflow (langflow-ai): 1.9.1langflow (PyPI): 1.9.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Langflowlangflowbefore 1.9.11.9.1Patch availableCNA
—langflow (PyPI)before 1.9.11.9.1Patch availableGHSA-x223-p2gf-v735
  • langflow VendorLangflow Affected before 1.9.1 Fixed in 1.9.1 Patch available CNA
  • langflow (PyPI) Vendor— Affected before 1.9.1 Fixed in 1.9.1 Patch available GHSA-x223-p2gf-v735

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*before 1.9.1VulnerableLangflow
  • cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:* Versions before 1.9.1 Vulnerable ·Langflow

Remediation

  • Fix · CNA langflow (langflow-ai) Fixed in 1.9.1
  • Fix · GHSA-x223-p2gf-v735 langflow (PyPI) Fixed in 1.9.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55450
  2. 2026-10-03 Alias added: GHSA-x223-p2gf-v735

References

Exploit 1

Patch 1

Other 1

  • TI-2026-08085 Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-00553 Langflow exec_globals Inclusion of Functionality from Untrusted Control Sphere Remote… KEVCVSS 3.0CRITICAL 9.8
  • TI-2025-24427 Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE KEVCVSS 4.0CRITICAL 9.4
  • TI-2025-02845 Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-25463 Langflow has Unauthenticated Remote Code Execution via Public Flow Build Endpoint KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-39928 Authorization bypass in langflow KEVCVSS 3.1HIGH 8.4
See all 216 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences