CVE-2026-6596 json
langflow-ai langflow API Endpoint endpoints.py create_upload_file unrestricted upload
published 2026-04-20 6 mo ago modified 2026-07-13 3 mo ago also GHSA-vvfc-fp59-m92g , PYSEC-2026-2572 , EUVD-2026-23745
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gist.github.com https://gist.github.com/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | 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 |
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| CNA | 3.0 | 7.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| CNA | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR |
| CNA | 4.0 | 5.5 | 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| CNA | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| OSV | 3.1 | 7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
| GitHub | 3.1 | 7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | langflow-base | <0.9.1 |
0.9.1 |
Affected products
- langflow-ai langflow
Classification
References
-
github.com
/langflow-ai/langflow/commit/b5662446bc8c54d928e278d3d26ad95b62425815
web
-
gist.github.com
/chenhouser2025/c2aabfdee41009cfe45d28a9924742a0
exploit, web
-
vuldb.com
/vuln/358231
vdb-entry, technical-description, web
-
vuldb.com
/vuln/358231/cti
signature, permissions-required, web
-
vuldb.com
/submit/791919
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-6596
advisory
-
github.com
/langflow-ai/langflow
package
-
github.com
/langflow-ai/langflow/commits/v1.9.1
web
-
pypi.org
/project/langflow-base
package
-
github.com
/advisories/GHSA-vvfc-fp59-m92g
advisory
Sources
- CVE List CVE-2026-6596
- GitHub Advisory GHSA-vvfc-fp59-m92g
- NVD CVE-2026-6596
- OSV PYSEC-2026-2572
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.