CVE-2026-27966Public exploitNetwork attack vector

Unauthenticated code execution via exposed Python REPL

Published Feb 26, 2026 · Updated Feb 26, 2026

Code injection in Langflow OSS before 1.8.0 allows remote attackers to execute arbitrary Python and OS commands through CSV Agent prompts. The CSV Agent hardcodes allow_dangerous_code as true, exposing LangChain's python_repl_ast tool and executing model-selected actions on the server. A reachable flow containing the CSV Agent and an attached LLM is required; no setting disables the tool, so injected prompts run with the server process's privileges.

CVSS severity9.8
Critical
EPSS probability33.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Langflow OSS before 1.8.0 allows remote attackers to execute arbitrary Python and OS commands through CSV Agent prompts. The CSV Agent hardcodes allow_dangerous_code as true, exposing LangChain's python_repl_ast tool and executing model-selected actions on the server. A reachable flow containing the CSV Agent and an attached LLM is required; no setting disables the tool, so injected prompts run with the server process's privileges.

The record

CVE
CVE-2026-27966
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
OpenBMC Project
Product
Langflow OSS
Classifications
CWE-94, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBMC Project · Langflow OSSversion=< 1.8.0

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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