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is a tool for building and deploying AI-powered agents and workflows. Versions 1.2.0 through 1.8.1 have a bypass of the patch for CVE-2025-68478 (External Control of File Name), leading to the root architectural issue within `LocalStorageService` remaining unresolved. Because the underlying storage layer lacks boundary containment checks, the system relies entirely on the HTTP-layer `ValidatedFileName` dependency. This defense-in-depth failure leaves the `POST /api/v2/files/` endpoint vulnerable to Arbitrary File Write. The multipart upload filename bypasses the path-parameter guard, allowing authenticated attackers to write files anywhere on the host system, leading to Remote Code Execution (RCE). Version 1.9.0 contains an updated fix.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-33309","reference_id":"","reference_type":"","scores":[{"value":"0.00056","scoring_system":"epss","scoring_elements":"0.17815","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-33309"},{"reference_url":"https://github.com/langflow-ai/langflow","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/langflow-ai/langflow"},{"reference_url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-g2j9-7rj2-gm6c","reference_id":"","reference_type":"","scores":[{"value":"10","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track*","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-03-24T17:47:04Z/"}],"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-g2j9-7rj2-gm6c"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33309","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33309"},{"reference_url":"https://github.com/advisories/GHSA-g2j9-7rj2-gm6c","reference_id":"GHSA-g2j9-7rj2-gm6c","reference_type":"","scores":[{"value":"CRITICAL","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-g2j9-7rj2-gm6c"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/47738?format=json","purl":"pkg:pypi/langflow@1.9.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-3kr1-vtdc-43hb"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/langflow@1.9.0"}],"aliases":["CVE-2026-33309","GHSA-g2j9-7rj2-gm6c","PYSEC-2026-79"],"risk_score":4.5,"exploitability":"0.5","weighted_severity":"8.9","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-rnzn-x922-vkav"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/9586?format=json","vulnerability_id":"VCID-z1h6-t53p-77aj","summary":"Langflow is a tool for building and deploying AI-powered agents and workflows. In versions 1.0.0 through 1.8.1, the `/api/v1/files/images/{flow_id}/{file_name}` endpoint serves image files without any authentication or ownership check. Any unauthenticated request with a known flow_id and file_name returns the image with HTTP 200. In a multi-tenant deployment, any attacker who can discover or guess a `flow_id` (UUIDs can be leaked through other API responses) can download any user's uploaded images without credentials. Version 1.9.0 contains a patch.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-33484","reference_id":"","reference_type":"","scores":[{"value":"0.00038","scoring_system":"epss","scoring_elements":"0.11705","published_at":"2026-05-30T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-33484"},{"reference_url":"https://github.com/langflow-ai/langflow","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/langflow-ai/langflow"},{"reference_url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-7grx-3xcx-2xv5","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-24T13:37:08Z/"}],"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-7grx-3xcx-2xv5"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33484","reference_id":"","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33484"},{"reference_url":"https://github.com/advisories/GHSA-7grx-3xcx-2xv5","reference_id":"GHSA-7grx-3xcx-2xv5","reference_type":"","scores":[{"value":"HIGH","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-7grx-3xcx-2xv5"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/47738?format=json","purl":"pkg:pypi/langflow@1.9.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-3kr1-vtdc-43hb"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/langflow@1.9.0"}],"aliases":["CVE-2026-33484","GHSA-7grx-3xcx-2xv5","PYSEC-2026-80"],"risk_score":3.4,"exploitability":"0.5","weighted_severity":"6.8","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-z1h6-t53p-77aj"}],"fixing_vulnerabilities":[],"risk_score":"4.5","resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/langflow@1.8.0rc1"}