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CVE-2026-55450 is a critical missing-authentication vulnerability in Langflow versions earlier than 1.9.1. A deprecated upload API function accepted uploads without verifying requester credentials or validating the referenced flow identifier. It also lacked effective upload-size controls, allowing unauthenticated remote users to submit arbitrary volumes of data. Responses disclose the absolute filesystem location assigned to an uploaded file, exposing server directory-layout information.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity Langflow vulnerability exposing sensitive information to unauthorized actors.
A critical unauthenticated file upload vulnerability in Langflow affecting versions prior to 1.9.1. The content shows successful detection against Langflow 1.9.0 and failure against patched 1.9.1 due to authentication enforcement.
An unauthenticated file upload vulnerability in Langflow that can cause denial of service through disk space exhaustion and leak the absolute path of uploaded files.
A critical unauthenticated file upload vulnerability in Langflow that allows remote attackers to upload unlimited data, causing denial of service through disk space exhaustion and leaking the server's absolute file path in the JSON response.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.