{"cve":"CVE-2026-59242","nvd":{"published":"2026-08-12T16:17:09.067","modified":"2026-10-24T16:10:00.153","status":"Analyzed","description":"Apache Airflow's XCom `GET /api/v2/{...}/xcomEntries/{key}?deserialize=true` endpoint passed a string-literal payload through `BaseXCom.deserialize_value` without the `_check_forbidden_xcom_keys` guard, allowing an authenticated API user with XCom write-and-read access to instantiate arbitrary `airflow.*` classes on the API server (CWE-502). An authenticated user who can write an XCom value and then read it back with `deserialize=true` triggers the unsafe instantiation. Users are advised to upgrade to apache-airflow 3.3.1 or later, which rejects reserved XCom serialization keys submitted as JSON string literals.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","score":5.4},"cwes":["CWE-502"],"references":["https://github.com/apache/airflow/pull/69378","https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg","http://www.openwall.com/lists/oss-security/2026/08/12/6"],"products":["apache:airflow"],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-59242","score":0.00529,"percentile":0.44478,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-fcmm-42r9-mmmm","url":"https://osv.dev/vulnerability/GHSA-fcmm-42r9-mmmm","summary":"Apache Airflow XCom API permits unsafe deserialization through JSON string literals","modified":"2026-10-02T23:40:42.734966774Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":["<3.3.1"],"fixed":["3.3.1"]}]},{"id":"PYSEC-2026-3992","url":"https://osv.dev/vulnerability/PYSEC-2026-3992","summary":"","modified":"2026-10-15T14:45:08.237804283Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":["<3.3.1"],"fixed":["3.3.1"]}]}],"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."]}