Advisory details:
pypa / langflow-base/PYSEC-2026-2572
| Advisory ID | pypa/langflow-base/PYSEC-2026-2572 |
| Aliases |
CVE-2026-6596
GHSA-vvfc-fp59-m92g PYSEC-2026-2572 |
| Summary | Langflow: DoS Through Lack of File Size Restriction via Deprecated Unauthenticated File Upload API 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.6 |
| Risk | 3.3 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.3 | https://github.com/pypa/advisory-database/blob/main/vulns/langflow-base/PYSEC-2026-2572.yaml |
| cvssv4 | 5.5 | https://github.com/pypa/advisory-database/blob/main/vulns/langflow-base/PYSEC-2026-2572.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/langflow-ai/langflow | ||
| https://github.com/langflow-ai/langflow/commit/b5662446bc8c54d928e278d3d26ad95b62425815 | ||
| https://github.com/langflow-ai/langflow/commits/v1.9.1 | ||
| https://pypi.org/project/langflow-base | ||
| 358231 | Advisory | https://vuldb.com/vuln/358231 |
| 791919 | Advisory | https://vuldb.com/submit/791919 |
| c2aabfdee41009cfe45d28a9924742a0 | Exploit | https://gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0 |
| cti | Other | https://vuldb.com/vuln/358231/cti |
| CVE-2026-6596 | https://nvd.nist.gov/vuln/detail/CVE-2026-6596 | |
| GHSA-vvfc-fp59-m92g | https://github.com/advisories/GHSA-vvfc-fp59-m92g |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-20T14:54:09Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/6xxx/CVE-2026-6596.json
Source Advisory: vulnrichment/CVE-2026-6596
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]