Langflow: Weak Fernet Key via random.seed()

langflow (pip)

### Summary Langflow uses Python's `random` module (Mersenne Twister, a non-cryptographic PRNG) seeded with the `SECRET_KEY` to derive the Fernet encryption key for all stored user credentials (API keys, LLM provider secrets, database passwords). When the `SECRET_KEY` is shorter than 32 characters — a common scenario for self-hosted deployments using…

First seen: 5 Oct 2026
Last update: 5 Oct 2026, 22:31 UTC
Fixed in: langflow 1.10.1
Identifiers: CVE-2026-9205
CVSS: 9.8
Source: GitHub advisory
On the menu as: PyPI packages
LLM gateways

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Langflow: Weak Fernet Key via random.seed()
Severity: critical. Patch status: patched.
Affected: langflow (pip)
Fixed in: langflow 1.10.1
Ids: CVE-2026-9205

### Summary Langflow uses Python's `random` module (Mersenne Twister, a non-cryptographic PRNG) seeded with the `SECRET_KEY` to derive the Fernet encryption key for all stored user credentials (API keys, LLM provider secrets, database passwords). When the `SECRET_KEY` is shorter than 32 characters — a common scenario for self-hosted deployments using…

## Steps
1. Search every lockfile and manifest (package-lock.json, yarn.lock, pnpm-lock.yaml, requirements*.txt, poetry.lock, uv.lock, composer.lock, go.sum, Cargo.lock, Gemfile.lock) for `langflow`. For each hit, compare the installed version with the fix on the same major line: langflow 1.10.1. If it's lower, give the exact upgrade command for the package manager this repo uses.
2. This incident involves a provider (ai-gateways). Search config, CI and env templates (.env.example, wrangler.toml, vercel.json, terraform, workflow secrets) for credentials stored there. List each secret by name, where it is used, and how to rotate it. Never print secret values.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-9205") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-jxw3-mjmx-3pqm https://github.com/langflow-ai/langflow/commit/094694d3f20c1da499f4d8dbac15c510609e3026 https://github.com/langflow-ai/langflow/pull/13704 https://github.com/langflow-ai/langflow/security/advisories/GHSA-jxw3-mjmx-3pqm https://nvd.nist.gov/vuln/detail/CVE-2026-9205
https://pwned.coffee/i/langflow-weak-fernet-key-via-random-seed-cve-2026-9205

Sources

Totalone very hot coffee