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CVE-2026-8859 is a path traversal vulnerability in IBM Langflow OSS affecting versions 1.0.0 through 1.10.0. The flaw is in the APIRequest component when the "Save to File" feature is enabled. Langflow derives output filenames from the HTTP response Content-Disposition header and joins those filenames to a temporary directory path without sanitizing traversal sequences. An attacker who controls the external HTTP server responding to the APIRequest can return a crafted filename containing path traversal elements, causing Langflow to write files outside the intended temporary directory and into other filesystem locations writable by the Langflow process.
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A high-severity path traversal vulnerability in Langflow OSS APIRequest handling that can enable arbitrary file writes and, in Docker deployments, may be escalated to remote code execution.
A path traversal vulnerability in IBM Langflow OSS that can allow arbitrary file writes to unintended locations via unsanitized filenames from HTTP response Content-Disposition headers in the APIRequest component when the Save to File feature is enabled.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.