CVE-2026-9138: IBM Langflow OSS 1.0.0 through 1.11.2 Langflow could allow an authenticated attacker to write arbitrary files to the ser
Summary
IBM Langflow OSS versions 1.0.0 through 1.11.2 have a vulnerability where an authenticated attacker can write arbitrary files (any file they choose) to the server. The problem occurs because the SaveToFileComponent doesn't properly validate user input when processing requests, allowing attackers to use path traversal (special sequences that navigate to different directories) to write files outside the intended location.
Vulnerability Details
6.5(medium)
EPSS: 0.0%
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
network
low
low
none
September 4, 2026
Classification
Taxonomy References
Affected Vendors
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Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-9138
First tracked: September 4, 2026 at 02:08 PM
Classified by LLM (prompt v3) · confidence: 92%