{"id":"CVE-2026-111421","aliases":[],"cve":{"records":[{"id":"CVE-2026-111421","source":"apache","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-16T02:28:03.557Z","published":"2026-11-09T09:15:29.744Z","modified":"2026-11-09T15:10:06.471Z"}],"publishers":[{"name":"apache","role":"CNA","organizationId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","modified":"2026-11-09T09:15:29.744Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-11-09T15:10:06.471Z"}],"references":[{"url":"https://github.com/apache/airflow/pull/72718","tags":["patch"],"source":"apache"},{"url":"https://github.com/apache/airflow/pull/74829","tags":["patch"],"source":"apache"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59242","tags":["related"],"source":"apache"},{"url":"https://lists.apache.org/thread.html/pwdwx354tv0x3m8wzfhh59r6wyztj2lk","tags":["vendor-advisory"],"source":"apache"}],"weaknesses":[{"id":"CWE-502","description":"CWE-502: Deserialization of Untrusted Data","source":"apache"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-11-09T15:09:46.042477Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"total"}]}]},"title":"Apache Airflow: Execution API: set_xcom skips the reserved-key check, so task-written XComs instantiate airflow.* classes on the API server","titleSource":"apache","descriptionSource":"apache","description":"Apache Airflow's Task Execution API stored XCom values written by a task without the reserved-key check applied elsewhere, so a Dag author's task could write an XCom that, when a user later viewed it through the API with deserialization enabled, made the API server instantiate classes from the `airflow.*` namespace with arguments the Dag author chose. This is an incomplete fix for CVE-2026-59242: users who applied that fix in apache-airflow 3.3.1 remain affected through this route and should upgrade to apache-airflow 3.4.0 or later.","score":8.8,"severity":"high","published":"2026-11-09T09:15:29.744Z","modified":"2026-11-09T15:10:06.471Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Apache Software Foundation","name":"Apache Airflow","platforms":[],"versions":[{"version":"3.0.0","status":"affected","lessThan":"3.4.0","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:pypi/apache-airflow-core","packageIdentity":{"ecosystem":"PyPI","name":"apache-airflow-core"},"cpes":[],"source":"apache","url":"https://www.cve.org/CVERecord?id=CVE-2026-111421"}],"remediation":[],"references":["https://github.com/apache/airflow/pull/72718","https://github.com/apache/airflow/pull/74829","https://www.cve.org/CVERecord?id=CVE-2026-59242","https://lists.apache.org/thread.html/pwdwx354tv0x3m8wzfhh59r6wyztj2lk"],"sources":[{"name":"CVE","id":"CVE-2026-111421","modified":"2026-11-09T15:10:06.471Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-111421"}],"assessments":[{"source":"CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"observedAt":"2026-11-09T15:15:45.206Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:25:31.038Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-11-09T09:30:35.904Z","attemptedAt":"2026-11-09T09:30:35.904Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-09T09:30:36.597Z","attemptedAt":"2026-11-09T09:30:36.597Z"},{"source":"EUVD","status":"no-result","checkedAt":"2026-11-09T09:30:35.900Z","attemptedAt":"2026-11-09T09:30:35.900Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-11-09T09:30:36.649Z","attemptedAt":"2026-11-09T09:30:36.649Z"}],"evidence":[],"aiSummary":{"text":"Apache Airflow 3.0.0 to 3.3.1 is affected by a deserialization vulnerability, allowing a task to write XCom values that instantiate `airflow.*` classes on the API server. A Dag author's task can exploit this. Upgrade to 3.4.0 or later to fix.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-09T09:26:06.956Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-111421"}]}}