CVE-2026-55450: Langflow is a tool for building and deploying AI-powered agents and workflows

Q: How do I fix CVE-2026-55450?

langflow: upgrade to 1.9.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-55450 being exploited?

CVE-2026-55450 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-55450 affect?

CVE-2026-55450 affects langflow. Severity is critical (CVSS 9.3). 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 t

Q: How urgent is CVE-2026-55450?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.3REMOTEUPGRADE

CVE-2026-55450 is a critical-severity flaw (CVSS 9.3) affecting langflow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 cha

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-200, CWE-306, CWE-400
Published	2026-06-23
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: langflow

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 17:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

langflow langflow UPGRADE

Affected: < 1.9.1

Fixed in: 1.9.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy langflow || rpm -q langflow || langflow --version

2. UPGRADE to 1.9.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade langflow

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade langflow

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Python (pip) · langflow · FIXED · 1.9.1 · vulnerable: < 1.9.1 · source

pip install --upgrade "langflow>=1.9.1" pip show langflow

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: 0xBlackash/CVE-2026-55450 (0 stars)
Write-up: github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735
Nuclei scan template: Langflow < 1.9.1 - Unauthenticated File Upload

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55450?

langflow: upgrade to 1.9.1. Exact commands for each OS are on this page.

Is CVE-2026-55450 being exploited?

CVE-2026-55450 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55450 affect?

CVE-2026-55450 affects langflow. Severity is critical (CVSS 9.3). 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 t

How urgent is CVE-2026-55450?

Priority 59/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-7528 HIGH 7.1 UPGRADE IBM Langflow OSS 1.0.0 through 1.9.0 could allow a denial of service due to uncontrolled resource consumption.
CVE-2026-5022 MEDIUM 5.3 MITIGATE The '/api/v1/files/images/{flow_id}/{file_name}' endpoint does not enforce any authentication or authorization
CVE-2026-55255 HIGH 8.4 EXPLOITED UPGRADE Langflow Authorization Bypass Through User-Controlled Key Vulnerability
CVE-2026-10561 CRITICAL 10.0 UPGRADE IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution com
CVE-2026-55447 CRITICAL 9.6 UPGRADE Langflow is a tool for building and deploying AI-powered agents and workflows

References

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