Hackers Exploit Langflow Vulnerability for Remote Code Execution
Source Reddit Cybersecurity
Public exploit available (Exploit-DB) · CVSS 8.8 High.
Data as of 30 Oct 2026, 06:59 UTC
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 27 Mar 2026
Detectable: evidence found.
nuclei template: Langflow <= 1.8.4 - Path Traversal to RCE via File Upload
Weaponized: evidence found.
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by Tenable Network Security, Inc.
, 3 minutes before disclosure
CVE published
on cve.org
, t = 0
In Threat Radar
record ingested
, 20 minutes after disclosure
First Exploit-DB entry (opens in a new tab)
Langflow 1.8.4 - Path Traversal to Remote Code Execution
, 157 days after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| langflow-ailangflow | Affected
| Fixed in– |
GitHublangflowpkg:github/langflowOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Until an official fix is available, restrict access to Langflow instances from untrusted networks, disable or restrict the vulnerable endpoint if possible, and monitor for suspicious activity related to file uploads. Follow updates from Langflow and security advisories for patch releases.
Discussion
A high-severity vulnerability (CVE-2026-5027) in the Langflow low-code AI development platform allows unauthenticated attackers to write files to arbitrary locations via a path traversal flaw in the 'POST /api/v2/files' endpoint. This flaw enables remote code execution (RCE) because the filename parameter is not sanitized, and Langflow's default unauthenticated auto-login allows attackers to reach the vulnerable endpoint without credentials. Exploitation attempts have been observed in the wild, with attackers dropping test files on victim systems. Approximately 7,000 Langflow instances are internet-accessible, mostly in North America. The vulnerability was publicly disclosed in March 2026, and no patch or official fix information is provided in the source content.
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