Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / langflow/PYSEC-2026-224
Advisory ID pypa/langflow/PYSEC-2026-224
Aliases CVE-2026-55450
GHSA-x223-p2gf-v735
PYSEC-2026-224
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.
Status Published
Exploitability 0.5
Weighted Severity 8.4
Risk 4.2
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3.1 9.3 https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2026-224.yaml
Reference id Reference type URL
https://github.com/langflow-ai/langflow/pull/12831
https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H Found at https://github.com/pypa/advisory-database/blob/main/vulns/langflow/PYSEC-2026-224.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-06-23T17:00:33Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/55xxx/CVE-2026-55450.json

Source Advisory: vulnrichment/CVE-2026-55450

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]