CVEs / CVE-2026-27966

CVE-2026-27966: langflow-ai langflow vulnerability

critical 9.8 CVSS 3.1 (from the CNA)
EPSS 35.2% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
Last changed at its sources 28 Oct 2026

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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.
The CVE record, via NVD · published 26 Feb 2026 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
langflow-ai langflow	< 1.8.0	—

As stated by OSV
Product	Affected	Fixed in
langflow (PyPI)	up to and including 1.8.0rc2	—

Package versions from GHSA-3645-fxcv-hqr4.

Exploitation

Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.

Severity

CVSS 3.1	9.8 critical `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Scored by the CNA ([email protected])
Weakness	CWE-94

References

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.