Vulnerability-Lookup

CVE-2026-55450 (GCVE-0-2026-55450)

Vulnerability from cvelistv5 – Published: 2026-06-23 16:17 – Updated: 2026-06-23 17:02

Previdian

Title

Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

Summary

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

Severity

9.3 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 17:00 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-306 - Missing Authentication for Critical Function
CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7861 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/langflow-ai/langflow/security/…	x_refsource_CONFIRM
https://github.com/langflow-ai/langflow/pull/12831	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
langflow-ai	langflow	Affected: < 1.9.1	guessed

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

KEV entry ID: 50f1ad27-2588-4452-831b-fa1418b9e973

Vulnerability ID: CVE-2026-55450

Status: Confirmed

Status Updated: 2026-08-09 12:09 UTC

Exploited: Yes

Timestamps

First Seen: 2026-08-09

Asserted: 2026-08-09

Scope

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details

Feed	KEVIntel (kevintel.com)
Title	Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak
Vendor	langflow-ai
Product	langflow
Added Date	2026-08-09T12:09:32.943Z
Cvss Score	9.3
Epss Score	0.11819
Cvss Severity	CRITICAL
Epss Percentile	0.95685
Used In Malware	unknown
Ahead Of Cisa Kev	None
Not Yet In Cisa Kev	True

References

Created: 2026-08-09 13:00 UTC | Updated: 2026-08-09 13:00 UTC

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-55450

Vulnerability from fkie_nvd - Published: 2026-06-23 17:17 - Updated: 2026-10-25 23:10

Previdian

Severity

9.3 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/langflow-ai/langflow/pull/12831	Issue Tracking, Patch
security-advisories@github.com	https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735	Exploit, Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735	Exploit, Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	langflow	langflow	*

JSON

To clipboard

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GHSA-X223-P2GF-V735

Vulnerability from github – Published: 2026-06-17 18:43 – Updated: 2026-06-17 18:43

Summary

Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak

Details

Summary

Unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow.

This can lead to space exhaustion on the server.

In adition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives.

Tested on commit 2d67402b1dbaefcbce85a244d4a6cd5e4bda1cfe

Details

Code is in langflow/api/v1/[endpoints.py](http://endpoints.py/):

@router.post(
    "/upload/{flow_id}",
    status_code=HTTPStatus.CREATED,
    deprecated=True,
)
async def create_upload_file(
    file: UploadFile,
    flow_id: UUID,
) -> UploadFileResponse:
...

As can be seen above, there is no authentication. There is not validation over flow_id as well, unlike other endpoints:

        flow_id_str = str(flow_id)
        file_path = await asyncio.to_thread(save_uploaded_file, file, folder_name=flow_id_str)

Function save_uploaded_file saves the file to local file-system. Suggested fix: 1. Add authentication to route. 2. Only return relative path or filename.

PoC

PoC:

curl 'http://localhost:7860/api/v1/upload/<any_uuid>' -F "file=@<any_file>"

Example:

# curl 'http://localhost:7860/api/v1/upload/11111111-1111-1111-1111-111111111111' -F "file=@/tmp/dummy.txt"
{"flowId":"11111111-1111-1111-1111-111111111111","file_path":"/Users/ori/Library/Caches/langflow/11111111-1111-1111-1111-111111111111/9d63c3b5b7623d1fa3dc7fd1547313b9546c6d0fbbb6773a420613b7a17995c8.txt"}

Impact

Space exhaustion on server that can lead to Denial-of-Service.
Information leak - leakage of absolute path of langflow's cache directory in server.

Patches

Fixed in 1.9.1 via PR #12831. The deprecated POST /api/v1/upload/{flow_id} endpoint now uses the get_flow dependency, requiring an authenticated user and flow ownership (returns 404 for missing or cross-user flows), and enforces the max_file_size_upload limit (HTTP 413) — closing the unauthenticated upload and disk-exhaustion vectors. Upgrade to 1.9.1 or later.

Note: the response still returns the file's absolute path (file_path); after this fix it is only disclosed to the authenticated owner of the flow.

Ori Lahav Security Researcher @ Rubrik Inc.

Severity

9.3 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "langflow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55450"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-306",
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-17T18:43:12Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Summary\nUnauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow.\n\nThis can lead to space exhaustion on the server.\n\nIn adition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives.\n\nTested on commit 2d67402b1dbaefcbce85a244d4a6cd5e4bda1cfe\n\n### Details\nCode is in `langflow/api/v1/[endpoints.py](http://endpoints.py/)`:\n```python\n@router.post(\n    \"/upload/{flow_id}\",\n    status_code=HTTPStatus.CREATED,\n    deprecated=True,\n)\nasync def create_upload_file(\n    file: UploadFile,\n    flow_id: UUID,\n) -\u003e UploadFileResponse:\n...\n```\nAs can be seen above, there is no authentication. There is not validation over `flow_id` as well, unlike other endpoints:\n```\n        flow_id_str = str(flow_id)\n        file_path = await asyncio.to_thread(save_uploaded_file, file, folder_name=flow_id_str)\n```\nFunction `save_uploaded_file` saves the file to local file-system.\nSuggested fix:\n1. Add authentication to route.\n2. Only return relative path or filename.\n\n### PoC\nPoC:\n```bash\ncurl \u0027http://localhost:7860/api/v1/upload/\u003cany_uuid\u003e\u0027 -F \"file=@\u003cany_file\u003e\"\n```\n\nExample:\n```bash\n# curl \u0027http://localhost:7860/api/v1/upload/11111111-1111-1111-1111-111111111111\u0027 -F \"file=@/tmp/dummy.txt\"\n{\"flowId\":\"11111111-1111-1111-1111-111111111111\",\"file_path\":\"/Users/ori/Library/Caches/langflow/11111111-1111-1111-1111-111111111111/9d63c3b5b7623d1fa3dc7fd1547313b9546c6d0fbbb6773a420613b7a17995c8.txt\"}\n```\n\n### Impact\n1. Space exhaustion on server that can lead to Denial-of-Service.\n2. Information leak - leakage of absolute path of langflow\u0027s cache directory in server.\n\n\n\n\n\n### Patches\nFixed in **1.9.1** via PR [#12831](https://github.com/langflow-ai/langflow/pull/12831). The deprecated `POST /api/v1/upload/{flow_id}` endpoint now uses the `get_flow` dependency, requiring an authenticated user and flow ownership (returns `404` for missing or cross-user flows), and enforces the `max_file_size_upload` limit (`HTTP 413`) \u2014 closing the unauthenticated upload and disk-exhaustion vectors. Upgrade to **1.9.1 or later**.\n\nNote: the response still returns the file\u0027s absolute path (`file_path`); after this fix it is only disclosed to the authenticated owner of the flow.\n\n\nOri Lahav\nSecurity Researcher @ Rubrik Inc.",
  "id": "GHSA-x223-p2gf-v735",
  "modified": "2026-06-17T18:43:12Z",
  "published": "2026-06-17T18:43:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735"
    },
    {
      "type": "WEB",
      "url": "https://github.com/langflow-ai/langflow/pull/12831"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/langflow-ai/langflow"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak"
}

PYSEC-2026-224

Vulnerability from pysec - Published: 2026-06-23 17:17 - Updated: 2026-06-25 23:10

Details

Severity

9.3 (Critical)


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

Impacted products

Name	purl
langflow	pkg:pypi/langflow

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "langflow",
        "purl": "pkg:pypi/langflow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.31",
        "0.0.32",
        "0.0.33",
        "0.0.40",
        "0.0.44",
        "0.0.45",
        "0.0.46",
        "0.0.52",
        "0.0.53",
        "0.0.54",
        "0.0.55",
        "0.0.56",
        "0.0.57",
        "0.0.58",
        "0.0.61",
        "0.0.62",
        "0.0.63",
        "0.0.64",
        "0.0.65",
        "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",
        "0.0.78",
        "0.0.79",
        "0.0.80",
        "0.0.81",
        "0.0.83",
        "0.0.84",
        "0.0.85",
        "0.0.86",
        "0.0.87",
        "0.0.88",
        "0.0.89",
        "0.1.0",
        "0.1.2",
        "0.1.3",
        "0.1.4",
        "0.1.5",
        "0.1.6",
        "0.1.7",
        "0.2.0",
        "0.2.1",
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        "0.2.11",
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        "0.6.0rc1",
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        "1.1.1",
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        "1.1.3",
        "1.1.4",
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        "1.3.1",
        "1.3.2",
        "1.3.3",
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        "1.4.3",
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        "1.5.0.post2",
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        "1.6.2",
        "1.6.3",
        "1.6.4",
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        "1.7.1",
        "1.7.2",
        "1.7.3",
        "1.8.0",
        "1.8.0rc0",
        "1.8.0rc1",
        "1.8.0rc2",
        "1.8.0rc3",
        "1.8.0rc4",
        "1.8.0rc5",
        "1.8.0rc6",
        "1.8.1",
        "1.8.2",
        "1.8.3",
        "1.8.3rc0",
        "1.8.4",
        "1.9.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55450",
    "GHSA-x223-p2gf-v735"
  ],
  "details": "Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.",
  "id": "PYSEC-2026-224",
  "modified": "2026-06-25T23:10:36.756076Z",
  "published": "2026-06-23T17:17:08.663Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/langflow-ai/langflow/pull/12831"
    },
    {
      "type": "FIX",
      "url": "https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

WID-SEC-W-2026-1970

Vulnerability from csaf_certbund - Published: 2026-06-16 22:00 - Updated: 2026-06-16 22:00

Summary

Langflow: Schwachstelle ermöglicht Denial of Service und Offenlegung von Informationen

Severity

Hoch

Scope

1 vulnerability in this advisory, including CVE-2026-55450.

CVE-2026-55450

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-55450 (GCVE-0-2026-55450)

Previdian

Known Exploited Vulnerability - GCVE BCP-07 Compliant

Timestamps

Scope

Evidence

Public Report Successful Exploitation Confidence: 70% Source: kevintel

Details

References

FKIE_CVE-2026-55450

GHSA-X223-P2GF-V735

Summary

Details

PoC

Impact

Patches

PYSEC-2026-224

WID-SEC-W-2026-1970

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour