CVE-2026-5027 in the critical feed json
Langflow - Path Traversal Arbitrary File Write via upload_user_file
published 2026-03-27 7 mo ago modified 2026-08-18 2 mo ago also EUVD-2026-16668
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 40.0%
- EPSS 40.0% chance of exploitation in 30 days, percentile 98%
- public exploits
- 1
- Exploit-DB, plus a Nuclei check
Summary
The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').
Timeline
- Published
- First public exploit (EDB-52659)
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
39.97% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-52659 Langflow 1.8.4 - Path Traversal to Remote Code Execution webapps, 2026-08-31
- Nuclei template Langflow <= 1.8.4 - Path Traversal to RCE via File Upload nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- langflow-ai langflow
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
tenable.com
/security/research/tra-2026-26
vendor-advisory, third-party-advisory
Sources
- CVE List CVE-2026-5027
- NVD CVE-2026-5027
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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.