{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-55450: Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-55450","status":"final","version":"1","initial_release_date":"2026-06-23T16:17:52.168Z","current_release_date":"2026-06-23T17:02:55.053Z","revision_history":[{"date":"2026-06-23T16:17:52.168Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-55450 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-55450"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-55450"},{"category":"external","summary":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735","url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735"},{"category":"external","summary":"https://github.com/langflow-ai/langflow/pull/12831","url":"https://github.com/langflow-ai/langflow/pull/12831"}]},"product_tree":{"branches":[{"category":"vendor","name":"langflow-ai","branches":[{"category":"product_name","name":"langflow","branches":[{"category":"product_version","name":"< 1.9.1","product":{"name":"langflow-ai langflow < 1.9.1","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:langflow-ai:langflow:\\<_1.9.1:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-55450","title":"Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak","notes":[{"category":"description","text":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H","baseScore":9.3,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}