id: PYSEC-2026-2572
published: "2026-07-13T15:02:51.309977Z"
modified: "2026-07-13T16:04:31.593444Z"
aliases:
- CVE-2026-6596
- GHSA-vvfc-fp59-m92g
summary: "Langflow: DoS Through Lack of File Size Restriction via Deprecated Unauthenticated File Upload API"
details: A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
affected:
- package:
    name: langflow-base
    ecosystem: PyPI
    purl: pkg:pypi/langflow-base
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 0.9.1
  versions:
  - 0.0.13
  - 0.0.14
  - 0.0.15
  - 0.0.16
  - 0.0.17
  - 0.0.18
  - 0.0.19
  - 0.0.20
  - 0.0.21
  - 0.0.22
  - 0.0.23
  - 0.0.24
  - 0.0.25
  - 0.0.26
  - 0.0.27
  - 0.0.28
  - 0.0.29
  - 0.0.30
  - 0.0.31
  - 0.0.32
  - 0.0.33
  - 0.0.34
  - 0.0.35
  - 0.0.36
  - 0.0.37
  - 0.0.38
  - 0.0.39
  - 0.0.40
  - 0.0.41
  - 0.0.42
  - 0.0.43
  - 0.0.44
  - 0.0.45
  - 0.0.46
  - 0.0.47
  - 0.0.48
  - 0.0.49
  - 0.0.50
  - 0.0.51
  - 0.0.52
  - 0.0.53
  - 0.0.54
  - 0.0.55
  - 0.0.56
  - 0.0.57
  - 0.0.58
  - 0.0.59
  - 0.0.60
  - 0.0.61
  - 0.0.62
  - 0.0.63
  - 0.0.64
  - 0.0.66
  - 0.0.67
  - 0.0.68
  - 0.0.69
  - 0.0.70
  - 0.0.71
  - 0.0.72
  - 0.0.73
  - 0.0.74
  - 0.0.75
  - 0.0.76
  - 0.0.77
  - 0.0.78
  - 0.0.79
  - 0.0.80
  - 0.0.81
  - 0.0.82
  - 0.0.83
  - 0.0.84
  - 0.0.85
  - 0.0.86
  - 0.0.87
  - 0.0.88
  - 0.0.89
  - 0.0.90
  - 0.0.91
  - 0.0.92
  - 0.0.93
  - 0.0.94
  - 0.0.95
  - 0.0.96
  - 0.0.97
  - 0.0.98
  - 0.0.99
  - 0.1.0
  - 0.1.1
  - 0.1.2
  - 0.1.3
  - 0.1.4
  - 0.1.4.post1
  - 0.2.0
  - 0.3.0
  - 0.3.1
  - 0.3.2
  - 0.3.3
  - 0.3.4
  - 0.4.0
  - 0.4.1
  - 0.4.2
  - 0.4.3
  - 0.5.0
  - 0.5.0.post1
  - 0.5.0.post2
  - 0.5.1
  - 0.6.0
  - 0.6.1
  - 0.6.2
  - 0.6.3
  - 0.6.4
  - 0.6.5
  - 0.6.6
  - 0.6.7
  - 0.6.8
  - 0.6.9
  - 0.7.0
  - 0.7.1
  - 0.7.2
  - 0.7.3
  - 0.8.0
  - 0.8.0rc0
  - 0.8.0rc1
  - 0.8.0rc2
  - 0.8.0rc3
  - 0.8.0rc4
  - 0.8.0rc5
  - 0.8.0rc6
  - 0.8.1
  - 0.8.2
  - 0.8.3
  - 0.8.3rc0
  - 0.8.4
  - 0.9.0
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-6596
- type: WEB
  url: https://github.com/langflow-ai/langflow/commit/b5662446bc8c54d928e278d3d26ad95b62425815
- type: WEB
  url: https://gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0
- type: PACKAGE
  url: https://github.com/langflow-ai/langflow
- type: WEB
  url: https://github.com/langflow-ai/langflow/commits/v1.9.1
- type: WEB
  url: https://vuldb.com/submit/791919
- type: WEB
  url: https://vuldb.com/vuln/358231
- type: WEB
  url: https://vuldb.com/vuln/358231/cti
- type: PACKAGE
  url: https://pypi.org/project/langflow-base
- type: ADVISORY
  url: https://github.com/advisories/GHSA-vvfc-fp59-m92g
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P