{"schemaVersion":3,"id":"CVE-2026-27966","aliases":["GHSA-3645-fxcv-hqr4","PYSEC-2026-376"],"status":"published","duplicateOf":null,"title":null,"description":"Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE). Version 1.8.0 fixes the issue.","dates":{"published":"2026-02-26T01:55:18.580Z","modified":"2026-02-28T04:55:26.622Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Pypi","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02547,"percentile":0.84875,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":-31.147000000000002,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.33694},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02399,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.02547,"percentile":0.84875}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.33694,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02399,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02492,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.02547,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.02547,"percentile":0.84875}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[{"id":"GITHUB_LANGFLOW-AI_LANGFLOW","name":"Langflow","source":"github","url":"https://github.com/langflow-ai/langflow/issues/1973","maturity":"poc","reliabilityScore":0.3,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"MSF_EXPLOIT_MULTI_HTTP_LANGFLOW_RCE_CVE_2026_27966","name":"Langflow RCE","source":"metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploit/multi/http/langflow_rce_cve_2026_27966.rb","maturity":"weaponized","reliabilityScore":1,"verified":true,"type":"remote","platforms":[],"requiresAuth":false,"exploitdb":null,"metasploit":{"fullname":"exploit/multi/http/langflow_rce_cve_2026_27966","rank":"600","rankName":"excellent","postAuth":false,"check":true,"stability":["crash-safe"],"sideEffects":["artifacts-on-disk","ioc-in-logs"],"reliability":["repeatable-session"]}}],"exploitCount":2,"weaknesses":[{"id":"CWE-94","name":"Improper Control of Generation of Code ('Code Injection')","description":"The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/94.html"}],"affected":[{"vendor":"langflow-ai","product":"langflow","name":"langflow","label":"langflow","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.0","eol":null,"hubHref":"/vendor/langflow-ai/langflow"},{"vendor":"langflow","product":"langflow","name":"Langflow","label":"langflow","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.0","eol":null,"hubHref":"/vendor/langflow/langflow"},{"vendor":"PyPI","product":"langflow","name":"langflow","label":"langflow","ecosystem":"PyPI","cpePart":null,"purl":"pkg:pypi/langflow","purlType":"pypi","versions":[{"text":"≤ 1.8.0rc2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 1.8.0rc2","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4","label":"github.com/langflow-ai/langflow/security/advisories/GHSA-3645-fxcv-hqr4","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Exploit","Vendor Advisory"]},{"url":"https://github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508","label":"github.com/langflow-ai/langflow/commit/d8c6480daa17b2f2af0b5470cdf5c3d28dc9e508","hostname":"github.com","tags":["X Refsource MISC","WEB","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27966","label":"nvd.nist.gov/vuln/detail/CVE-2026-27966","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/langflow-ai/langflow","label":"github.com/langflow-ai/langflow","hostname":"github.com","tags":["PACKAGE"]},{"url":"https://pypi.org/project/langflow","label":"pypi.org/project/langflow","hostname":"pypi.org","tags":["PACKAGE"]},{"url":"https://github.com/advisories/GHSA-3645-fxcv-hqr4","label":"github.com/advisories/GHSA-3645-fxcv-hqr4","hostname":"github.com","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-02-26T01:55:18.580Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-02-28T04:55:26.622Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T06:32:58.160Z","stale":false,"partial":false}}