HighVulnerability

CVE-2026-6596: Langflow unrestricted file upload in create_upload_file API endpoint

Source: NVD(opens in a new tab)
Identifier: CVE-2026-6596
Published: April 19, 2026
Record updated: October 9, 2026

Affected: langflow-base < 0.9.1
Fixed in: 0.9.1
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

CVE-2026-6596 is a flaw in langflow-ai langflow up to 1.1.0, in the create_upload_file function of src/backend/base/Langflow/api/v1/endpoints.py in the API Endpoint component. It allows unrestricted upload and can be exploited remotely. The exploit has been publicly released, and the vendor did not respond to early disclosure contact. CWE-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type) are associated with it.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.3(high)
Patch available: Yes
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: none
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 14, 2026.
Disclosure date: April 19, 2026

Weaknesses and techniques

Weakness (CWE): CWE-284
CWE-434
Attack pattern (CAPEC): CAPEC-1

Affected

Packages: langflow-base@< 0.9.1 (fixed: 0.9.1)

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Framework
Impact: Integrity,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-6596

First tracked: April 20, 2026 at 08:18 AM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

langflow-basePyPILLM dependency since 2024-04-01 · 1 tracked dependent

Summary

Mitigation

Affected packages in the Exposure Registry

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