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Report · Reddit CybersecurityAbout CVE-2026-5027Published

Hackers Exploit Langflow Vulnerability for Remote Code Execution

Source Reddit Cybersecurity

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Authoritative record:CVE-2026-5027· High 8.8

Public exploit available (Exploit-DB) · CVSS 8.8 High.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 27 Mar 2026

  2. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  3. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by Tenable Network Security, Inc.

    , 3 minutes before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. In Threat Radar

    record ingested

    , 20 minutes after disclosure

  4. 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

ProductAffectedFixed in
langflow-ailangflowAffected
  • =0
Fixed in–
GitHublangflowpkg:github/langflowOther threatsAffected
  • =0
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.

References

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