CVE-2026-33017

Langflow Code Injection

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 24.8%

Published20 Mar 2026
Added to CISA KEV25 Mar 2026
Remediation due8 Apr 2026

Description

Langflow is a tool for building and deploying AI-powered agents and workflows. In versions prior to 1.9.0, the POST /api/v1/build_public_tmp/{flow_id}/flow endpoint allows building public flows without requiring authentication. When the optional data parameter is supplied, the endpoint uses attacker-controlled flow data (containing arbitrary Python code in node definitions) instead of the stored flow data from the database. This code is passed to exec() with zero sandboxing, resulting in unauthenticated remote code execution. This is distinct from CVE-2025-3248, which fixed /api/v1/validate/code by adding authentication. The build_public_tmp endpoint is designed to be unauthenticated (for public flows) but incorrectly accepts attacker-supplied flow data containing arbitrary executable code. This issue has been fixed in version 1.9.0.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Langflow< 1.8.2

Remediation

Fixed in

Langflow≥ 1.8.2

Patch & vendor advisories

References

https://github.com/advisories/GHSA-rvqx-wpfh-mfx7Third Party Advisory
https://github.com/langflow-ai/langflow/commit/73b6612e3ef25fdae0a752d75b0fabd47328d4f0Patch
https://github.com/langflow-ai/langflow/releases/tag/1.8.2Release Notes
https://github.com/langflow-ai/langflow/security/advisories/GHSA-vwmf-pq79-vjvxExploitMitigationVendor Advisory
https://medium.com/@aviral23/cve-2026-33017-how-i-found-an-unauthenticated-rce-in-langflow-by-reading-the-code-they-already-dc96cdce5896ExploitThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-33017US Government Resource
https://www.sysdig.com/blog/cve-2026-33017-how-attackers-compromised-langflow-ai-pipelines-in-20-hoursPress/Media Coverage

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-33017 being actively exploited?

Yes. CVE-2026-33017 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Mar 2026.

How severe is CVE-2026-33017?

CVE-2026-33017 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 24.8% probability of exploitation.

Which products are affected by CVE-2026-33017?

Affected products include Langflow.

How do I fix CVE-2026-33017?

Upgrade affected software to a fixed version, for example Langflow 1.8.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33017 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.