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Advisory record · GHSA-3645-fxcv-hqr4

Langflow has Remote Code Execution in CSV Agent

CVSS 9.8 CriticalCriticalEPSS 0.35 · 98th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.
  • CVSS score 9.8 (7.0 or more) and EPSS 0.35 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 27 Feb 2026, 15:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
langflowPyPI<=1.8.0rc2No fixed version yet
Identifiers
GHSA-3645-fxcv-hqr4 · CVE-2026-27966 · PYSEC-2026-376
Weakness (CWE)
CWE-94
Tags
Published
27 Feb 2026
Updated
27 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The langflow PyPI package, versions up to and including 1.8.0rc2, has a CSV Agent node that hardcodes allow_dangerous_code=True, which exposes LangChain's Python REPL tool. An attacker who can get the agent's LLM to act on injected instructions (prompt injection) can run arbitrary Python and operating system commands on the server, giving full remote code execution. The source gives no fixed version; it recommends defaulting allow_dangerous_code to False or removing it, and adding an opt-in UI toggle if the feature is needed.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.35, the 98th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.