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Public proof of conceptFix available

CVE-2026-27966

A public proof of concept exists; no exploitation attested.

  • Published2026-02-26
  • Fixed in1.8.0
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE). Version 1.8.0 fixes the issue.

Timeline

dates in UTC
  1. 2026-02-2602:16CVE publishedNVD
  2. 2026-10-2523:12EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD · OSV
Langflow
BranchAffectedFixed in
1.8< 1.8.01.8.0
langflow
BranchAffectedFixed in
1.8≤ 1.8.0rc2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • langflow-ai langflow
    Affected
    • = < 1.8.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-02-26

Fix

  1. Update Langflow to 1.8.0

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
1 moduleexploit/multi/http/langflow_rce_cve_2026_27966rank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-02-26
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-3645-fxcv-hqr4

Frequently asked questions

What is CVE-2026-27966?

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE). Version 1.8.0 fixes the issue.

Is CVE-2026-27966 actively exploited?

A proof-of-concept exploit exists for CVE-2026-27966, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-27966?

CVE-2026-27966 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record