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Vulnerabilities

Vulnerability · CVE-2026-33309

Langflow is a tool for building and deploying AI-powered agents and workflows.

Published Mar 24, 2026 · catalog updated Oct 18, 2026 · Langflow Langflow

Patch now

CVE-2026-33309 is in the CISA known-exploited catalog. Confirm Langflow Langflow against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.9
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.05%
Remediation
Remediation guidance
Affected products
cpe langflow/langflow · vendor Langflow Langflow

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 remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer dependency. This defense-in-depth failure leaves the 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe langflow/langflowversion unspecified
  • vendor Langflow Langflowversion unspecified

How to fix CVE-2026-33309

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-33309 is in the CISA known-exploited catalog. Confirm Langflow Langflow against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-22: Path Traversal; CWE-284: Improper Access Control; CWE-73. EPSS 1.05%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 24, 2026 · NIST NVD

    Detected

    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 remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer dependency. This defense-in

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer dependency. This defense-in

  3. Oct 18, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  4. Oct 18, 2026 · VulnCheck KEV

    Updated

    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 remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer dependency. This defense-in

Sources

  • CVE.orgVulnerability recordCVE-2026-33309

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-33309

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-33309

    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 remaining unresolved. Be

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-33309

    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 remaining unresolved. Because the underlying s

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.