CVE-2026-59242
Apache Airflow's XCom `GET /api/v2/{...}/xcomEntries/{key}?deserialize=true` endpoint passed a string-literal payload through `BaseXCom.deserialize_value` with…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | apache-airflow | < 3.3.1 | 3.3.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apache | Airflow | before 3.3.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fcmm-42r9-mmmm
- https://nvd.nist.gov/vuln/detail/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
- https://github.com/apache/airflow/commit/78abd3044654d44d711eb61e475029fd1b1ccc23
- https://github.com/apache/airflow/commit/d08ddc0127d5be7f9b31c1f935bc4d25a897a848
- https://github.com/apache/airflow/releases/tag/3.3.1
- https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-3992.yaml