---
id: CVE-2026-55255
title: Langflow is a tool for building and deploying AI-powered agents and workflows
summary: >-
  Langflow is a tool for building and deploying AI-powered agents and workflows.
  Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in
  /api/v1/responses endpoint allows an authenticated attacker to execute any
  flow be…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L'
cwe:
  - CWE-639
vendor: langflow
product: langflow
affected:
  - langflow < 1.9.1
patched:
  - langflow 1.9.1
published: '2026-06-23'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T19:17:38.593'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55255'
references:
  - url: >-
      https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e
    label: security-advisories@github.com
  - url: 'https://github.com/langflow-ai/langflow/pull/12832'
    label: security-advisories@github.com
  - url: >-
      https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
    label: security-advisories@github.com
  - url: >-
      https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-qrpv-q767-xqq2'
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
  - cve.org
  - ghsa
  - pip
epss: 0.00887
epssPercentile: 0.59091
kev: true
kevDateAdded: '2026-07-07'
kevDueDate: '2026-07-10'
kevRansomware: false
exploited: true
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/rootdirective-sec/CVE-2026-55255-Lab'
  checkedAt: '2026-10-27T19:04:03.552Z'
exploitAvailable: true
ecosystem: pip
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-08T03:56:30.975870Z'
scores:
  nvd: 8.4
  cna: 8.4
  ghsa: 9.9
ingestedAt: '2026-06-22T13:35:24.306Z'
---

## Overview

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.

## Affected

- `langflow < 1.9.1`

## Remediation

Upgrade past the affected range:

- `langflow 1.9.1`

## Package advisory (CVE-2026-55255)

Affected packages:

- `langflow < 1.9.1`

Patched in:

- `langflow 1.9.1`

Source: https://github.com/advisories/GHSA-qrpv-q767-xqq2