{"schema":"threatline.record/2","record":{"id":"CVE-2026-59242","aliases":["BIT-airflow-2026-59242","GHSA-fcmm-42r9-mmmm","PYSEC-2026-3992"],"summary":"Apache Airflow XCom API permits unsafe deserialization through JSON string literals","details":"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.","categories":["Libraries & packages"],"product":"apache-airflow","vendor":"Apache Software Foundation","ecosystem":"pip","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-fcmm-42r9-mmmm","source_modified_at":"2026-10-02T23:12:56Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"pip","name":"apache-airflow"},"range":"< 3.3.1"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-59242","source_modified_at":"2026-09-16T14:55:43.129Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Apache Airflow","vendor":"Apache Software Foundation","versions":[{"lessThan":"3.3.1","status":"affected","version":"0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-fcmm-42r9-mmmm","source_modified_at":"2026-10-02T23:40:42.734966774Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"apache-airflow","ecosystem":"PyPI","purl":"pkg:pypi/apache-airflow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.1"}]}],"versions":["1.10.0","1.10.1","1.10.10","1.10.10rc1","1.10.10rc2","1.10.10rc3","1.10.10rc4","1.10.10rc5","1.10.11","1.10.11rc1","1.10.11rc2","1.10.12","1.10.12rc1","1.10.12rc2","1.10.12rc3","1.10.12rc4","1.10.13","1.10.13rc1","1.10.14","1.10.14rc1","1.10.14rc2","1.10.14rc3","1.10.14rc4","1.10.15","1.10.15rc1","1.10.1b1","1.10.1rc2","1.10.2","1.10.2b2","1.10.2rc1","1.10.2rc2","1.10.2rc3","1.10.3","1.10.3b1","1.10.3b2","1.10.3rc1","1.10.3rc2","1.10.4","1.10.4b2","1.10.4rc1","1.10.4rc2","1.10.4rc3","1.10.4rc4","1.10.4rc5","1.10.5","1.10.5rc1","1.10.6","1.10.6rc1","1.10.6rc2","1.10.7"]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-fcmm-42r9-mmmm","source_modified_at":"2026-10-02T23:12:56Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"pip","name":"apache-airflow"},"version":"3.3.1"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-59242","source_modified_at":"2026-09-16T14:55:43.129Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Apache Airflow","ecosystem":null},"version":"3.3.1","basis":"first unaffected version stated in the CVE record"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-fcmm-42r9-mmmm","source_modified_at":"2026-10-02T23:40:42.734966774Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"apache-airflow","ecosystem":"PyPI","purl":"pkg:pypi/apache-airflow"},"version":"3.3.1"}],"cvss":5.4,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00529,"percentile":0.43939,"score_date":"2026-10-23"},"published_at":"2026-08-12T15:35:00.763Z","modified_at":"2026-10-02T23:40:42.734966774Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-fcmm-42r9-mmmm","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-02T23:12:56Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-59242","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-09-16T14:55:43.129Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-fcmm-42r9-mmmm","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-02T23:40:42.734966774Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-59242","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59242","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/apache/airflow/pull/69378","tags":["patch"]},{"source":"CVE List","url":"https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg","tags":["vendor-advisory"]},{"url":"https://github.com/apache/airflow/commit/78abd3044654d44d711eb61e475029fd1b1ccc23","source":"GitHub Advisory Database"},{"url":"https://github.com/apache/airflow/commit/d08ddc0127d5be7f9b31c1f935bc4d25a897a848","source":"GitHub Advisory Database"},{"url":"https://github.com/apache/airflow/releases/tag/3.3.1","source":"GitHub Advisory Database"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-3992.yaml","source":"GitHub Advisory Database"},{"url":"https://github.com/advisories/GHSA-fcmm-42r9-mmmm","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-08-12T16:41:51.650384Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-02T23:40:42.734966774Z","content_hash":"792806f262ddf7ea5ad4f69f5f147fe39dc98d290c855d29ee264a6086c1d74c"}}