CVE-2026-33309: Langflow has an Arbitrary File Write (RCE) via v2 API
langflow-ai · langflow
Affected: langflow-ai · Exploitation: likely to be exploited (10% or more)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 96% of scored CVEs
DescriptionCVE.org
Langflow is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 (External Control of File Name), leading to the root architectural issue within `LocalStorageService` remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer `ValidatedFileName` dependency. This defense-in-depth failure leaves the `POST /api/v2/files/` endpoint vulnerable to Arbitrary File Write. The multipart upload filename bypasses the path-parameter guard, allowing authenticated attackers to write files anywhere on the host system, leading to Remote Code Execution (RCE). Version 1.9.0 contains an updated fix.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- langflow-ai · langflow>= 1.2.0, < 1.9.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- langflow-ai
- Published
- March 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-33309 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.