THREATPORT/VULNERABILITY/CVE-2026-27966
CRITICAL SEVERITY

CVE-2026-27966

Langflow vulnerability

CVSS
9.8
EPSS
33.7%
EPSS pct
98th
Exploited
No known
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.
Affected vendor
Langflow
Affected product
Langflow
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2026-02-26

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 33.7% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2026-27966

  • Confirm whether Langflow Langflow is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2026-27966.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2026-27966

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2026-27966 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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