Is CVE-2026-33873 actively exploited?

CVE-2026-33873 has no public evidence of in-the-wild exploitation as of 2026-04-03.

What is the CVSS score for CVE-2026-33873?

CVE-2026-33873 has a CVSS score of 9.3 (CRITICAL severity). Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-33873?

Patch guidance is available from langflow security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-33873.

Fix CVE-2026-33873 - CRITICAL langflow langflow

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.9.0, the Agentic Assistant feature in Langflow executes LLM-generated Python code during its validation phase. Although this phase appears intended to validate generated component code, the implementation reaches dynamic execution sinks and instantiates the generated class server-side. In deployments where an attacker can access the Agentic Assistant feature and influence the model output, this can result in arbitrary server-side Python execution. Version 1.9.0 fixes the issue.

CVSS Metrics

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-94 · Code Injection

Metadata

Primary Vendor: LANGFLOW
Published: 3/27/2026
Last Modified: 4/3/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-33873

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary