{"id":"CVE-2026-104317","kind":"vulnerability","aliases":["CVE-2026-104317"],"related":[],"title":"Langflow: message broker deserialization lets remote attacker run code","description":"IBM Langflow OSS 1.0.0 through 1.12.3 could allow a remote attacker who could reach the message broker to execute arbitrary code on the system due to the deserialization of untrusted data.","summary":"IBM Langflow OSS versions 1.0.0 through 1.12.3 deserialize untrusted data arriving through the message broker. An attacker who can reach that broker can execute arbitrary code on the host.","severity":"high","cvss":8.1,"epss":null,"exploited":false,"exploited_at":null,"products":[{"name":"langflow","fixed":["1.12.4"],"affected":">= 1.0.0, <= 1.12.3","ecosystem":"pypi"}],"ecosystems":[],"tags":["ai-tooling","langflow","message-broker","self-hosted"],"not_affected_if":["broker-not-reachable","managed-hosting"],"how_to_check":"- Check the installed Langflow version with `langflow --version` or `pip show langflow`, and treat `1.0.0` through `1.12.3` as affected.\n- Check whether the message broker used by the Langflow deployment is reachable from untrusted networks.","fix":"Upgrade Langflow OSS to 1.12.4 or later (IBM). A later IBM bulletin (28 Oct 2026) covers other flaws through 1.12.8 and recommends 1.13.0 or later, so move to 1.13.0+. Pip: pip install langflow --upgrade. Docker: pull the latest tagged image. IBM lists no workarounds.","status":"open","published_at":"2026-10-29T16:17:43+00:00","first_seen_at":"2026-10-29T16:25:54+00:00","triaged_at":"2026-10-29T16:29:35+00:00","updated_at":"2026-10-29T16:30:30+00:00","category":"ai-tooling","confidence":0.85,"triage":{"at":"2026-10-29T16:29:35Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Langflow: message broker deserialization lets remote attacker run code","impact":"high","summary":"IBM Langflow OSS versions 1.0.0 through 1.12.3 deserialize untrusted data arriving through the message broker. An attacker who can reach that broker can execute arbitrary code on the host.","audience":"businesses","category":"ai-tooling","nicknames":[],"who_cares":["langflow","self-hosted","message-broker"],"confidence":0.6,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Arbitrary code runs on the Langflow host via untrusted deserialized data.","analyst_note":"Confirm fixed version and default broker exposure from the IBM security bulletin, which the NVD entry does not name.","how_to_check":"- Check the installed Langflow version with `langflow --version` or `pip show langflow`, and treat `1.0.0` through `1.12.3` as affected.\n- Check whether the message broker used by the Langflow deployment is reachable from untrusted networks.","plain_action":"","needs_analyst":true,"not_affected_if":["managed-hosting","broker-not-reachable"],"who_is_affected":"Teams running self-hosted IBM Langflow OSS in the affected range where the message broker can be reached by an attacker, such as a broker exposed beyond the trusted network. The sources do not say which broker configuration is default, so unknown whether a standard deployment is exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000684,"input_tokens":4101,"output_tokens":547,"severity_before":"high"},"analyst_status":"done","analyst_note":"Confirm fixed version and default broker exposure from the IBM security bulletin, which the NVD entry does not name.","search":"'-104317':12A,15A '-2026':11A,14A '1.0.0':31B,59C '1.12.3':33B,61C 'ai':18B 'ai-tool':17B 'allow':63C 'arbitrari':51B,75C 'arriv':37B 'attack':7A,43B,66C 'broker':3A,23B,41B,48B,72C 'code':9A,52B,76C 'could':62C,68C 'cve':10A,13A 'data':36B,86C 'deseri':4A,34B,83C 'due':80C 'execut':50B,74C 'host':26B,55B 'ibm':27B,56C 'langflow':1A,16A,20B,28B,57C 'let':5A 'messag':2A,22B,40B,71C 'message-brok':21B 'oss':29B,58C 'reach':46B,69C 'remot':6A,65C 'run':8A 'self':25B 'self-host':24B 'system':79C 'tool':19B 'untrust':35B,85C 'version':30B","nicknames":[],"mitigations":[],"who_affected":"Teams running self-hosted IBM Langflow OSS in the affected range where the message broker can be reached by an attacker, such as a broker exposed beyond the trusted network. The sources do not say which broker configuration is default, so unknown whether a standard deployment is exposed.","tier":"B","verified":{"fix":{"at":"2026-10-29T16:30:30Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-langflow-oss-affected-multiple-vulnerabilities-0","run_id":1049},"products":{"at":"2026-10-29T16:30:30Z","by":"analyst","doc":"https://www.ibm.com/support/pages/security-bulletin-langflow-oss-affected-multiple-vulnerabilities-0","run_id":1049}},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T16:17:43+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"psirt@us.ibm.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-104317","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104317","severity":null,"published_at":"2026-10-29T16:17:43+00:00","modified_at":"2026-10-29T16:17:44+00:00","first_seen_at":"2026-10-29T16:25:54+00:00","fetched_at":"2026-10-29T16:25:54+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-104317:1049","url":null,"severity":null,"published_at":"2026-10-29T16:30:30+00:00","modified_at":"2026-10-29T16:30:30+00:00","first_seen_at":"2026-10-29T16:30:30+00:00","fetched_at":"2026-10-29T16:30:30+00:00","note":"IBM bulletin (19 Oct 2026) lists CVE-2026-104317, affected 1.0.0-1.12.3, fix 1.12.4, no workarounds. Bulletin does not state default broker exposure. A later IBM bulletin (28 Oct) covers other CVEs up to 1.12.8 and recommends 1.13.0, so 1.13.0+ covers both. No exploitation found in sources."}],"documents":[{"id":17743,"url":"https://www.ibm.com/support/pages/security-bulletin-langflow-oss-affected-multiple-vulnerabilities-0","title":"IBM Security Bulletin: Langflow OSS is affected by multiple vulnerabilities (19 Oct 2026)","kind":"advisory","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"advisory","confidence":null,"note":null}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}