HOMEVULNERABILITIESCVE-2026-33873
CRITICAL

CVE-2026-33873

CWE-94Published: March 27, 2026· Updated: Apr 3, 2026

9.9
CVSS v3.1
EPSS:0.08%probability of exploitation in 30 daysPercentile:23.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33873 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.9.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeChanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Vendors & Products

langflow1 product
langflow
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
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Official Patches & Advisories

All References (16)

Quick Facts

CVE IDCVE-2026-33873
CVSS Score9.9 / 10
SeverityCRITICAL
WeaknessCWE-94
CISA KEVNo
EPSS (30d)0.08%
Affected1 vendor
PublishedMar 27, 2026

Related CVEs (CWE-94)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2026-33873 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.