---
title: "CVE-2026-9205: Langflow: Weak Fernet Key via random.seed()"
url: https://erroneo.us/security/cve/CVE-2026-9205/
description: "CVE-2026-9205 (langflow (PyPI)): IBM Langflow OSS contains a weak cryptographic key derivation vulnerability in the ensurefernetkey() function."
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-05
date_modified: 2026-10-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-9205"
kev: false
cvss: 7.4
epss: 0.00302
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-9205: Langflow: Weak Fernet Key via random.seed()

**Signal:** Normal patch cycle. No exploitation signal; fix it in your next routine update if you are affected. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.3% , percentile 22: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 22% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes langflow (PyPI) <= 1.10.0, fixed in 1.10.1 . Check your lockfile, including transitive dependencies.

## What it is

IBM Langflow OSS contains a weak cryptographic key derivation vulnerability in the ensurefernetkey() function.

## Affected packages

- PyPI `langflow` <= 1.10.0 → fixed: 1.10.1

## Affected products (CVE record)

- IBM Langflow OSS: 1.0.0 <= 1.10.3

## Severity

- ibm CVSS 3.1: 7.4 `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.30% probability of exploitation activity in the next 30 days; percentile 22.

## Sources

- [ibm.com](https://www.ibm.com/support/pages/node/7282648)
- [GitHub Advisory GHSA-jxw3-mjmx-3pqm](https://github.com/advisories/GHSA-jxw3-mjmx-3pqm)
- [CVE.org record CVE-2026-9205](https://www.cve.org/CVERecord?id=CVE-2026-9205)
- [NVD entry CVE-2026-9205](https://nvd.nist.gov/vuln/detail/CVE-2026-9205)
- [github.com](https://github.com/langflow-ai/langflow/security/advisories/GHSA-jxw3-mjmx-3pqm)
- [github.com](https://github.com/langflow-ai/langflow/pull/13704)
- [github.com](https://github.com/langflow-ai/langflow/commit/094694d3f20c1da499f4d8dbac15c510609e3026)

---
Source page: https://erroneo.us/security/cve/CVE-2026-9205/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt