{"cve":"CVE-2026-34538","nvd":{"published":"2026-04-09T10:16:22.407","modified":"2026-10-26T21:10:00.170","status":"Analyzed","description":"Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with the FAB RBAC model, which treats XCom as a separate protected resource, and with the security model documentation that defines the Viewer role as read-only.\n\nAirflow uses the FAB Auth Manager to manage access control on a per-resource basis. The Viewer role is intended to be read-only by default, and the security model documentation defines Viewer users as those who can inspect DAGs without accessing sensitive execution results.\n\nUsers are recommended to upgrade to Apache Airflow 3.2.0 which resolves this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5},"cwes":["CWE-668"],"references":["https://github.com/apache/airflow/pull/64415","https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl","http://www.openwall.com/lists/oss-security/2026/04/09/9"],"products":["apache:airflow"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-34538","score":0.00685,"percentile":0.52334,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-r7vr-m4jw-r794","url":"https://osv.dev/vulnerability/GHSA-r7vr-m4jw-r794","summary":"Apache Airflow has an authorization bypass in DagRun wait endpoint","modified":"2026-09-10T03:51:03.113097615Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":[">=3.0.0 <3.2.0"],"fixed":["3.2.0"]}]},{"id":"PYSEC-2026-21","url":"https://osv.dev/vulnerability/PYSEC-2026-21","summary":"","modified":"2026-06-10T17:00:30.013366401Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":[">=3.0.0 <3.2.0"],"fixed":["3.2.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}