{"id":"CVE-2026-59242","title":"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…","summary":"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…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-502"],"vendor":"apache","product":"airflow","affected":["airflow < 3.3.1"],"patched":["airflow 3.3.1"],"published":"2026-08-12","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:17:38.930","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59242","references":[{"url":"https://github.com/apache/airflow/pull/69378","label":"security@apache.org"},{"url":"https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/08/12/6","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-12T16:41:51.650384Z"},"epss":0.00584,"epssPercentile":0.46675,"ingestedAt":"2026-09-16T15:58:38.720Z","slug":"CVE-2026-59242","body":"## Overview\n\nApache 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.\n\n## Affected\n\n- `airflow < 3.3.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `airflow 3.3.1`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}