Deserialization of Untrusted Data Affecting airflow-3 package, versions <3.3.1-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-AIRFLOW3-20416314
- published4 Oct 2026
- disclosed12 Aug 2026
Introduced: 12 Aug 2026
CVE-2026-59242 (opens in a new tab)How to fix?
Upgrade Minimos:latest airflow-3 to version 3.3.1-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream airflow-3 package and not the airflow-3 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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.
References
- https://www.cve.org/CVERecord?id=CVE-2026-59242
- https://github.com/advisories/GHSA-fcmm-42r9-mmmm
- https://osv.dev/vulnerability/MINI-mgv6-qgv3-r3j9
- https://osv.dev/vulnerability/CVE-2026-59242
- https://github.com/apache/airflow/pull/69378
- https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg
- http://www.openwall.com/lists/oss-security/2026/08/12/6