CVE-2026-5027
HIGHCVSS 8.8/10EPSS 31.41%
Last modified
CVE-2026-5027 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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 ('../').. EPSS estimates a 31.41% chance of exploitation in the next 30 days.
Description
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 ('../').
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Langflow | Langflow | < 1.9.0 |
References
- https://www.tenable.com/security/research/tra-2026-26Vendor Advisory, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-5027?
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 ('../').
How severe is CVE-2026-5027?
CVE-2026-5027 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 31.41% probability of exploitation in the next 30 days.
How do I fix CVE-2026-5027?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-5027?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST