Affects widely-used Apache Airflow; enables RCE via PATCH bypass; high risk across orgs.
CVE-2026-42359
RCE via PATCH bypass in Airflow XCom API; upgrade to 3.2.2+.
Is CVE-2026-42359 being exploited?
Not confirmed. CVE-2026-42359 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.57% probability of exploitation in the next 30 days.
How severe is CVE-2026-42359?
CVE-2026-42359 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-42359?
Yes. A fix has been recorded for CVE-2026-42359. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-42359 affect?
CVE-2026-42359 affects Apache Airflow. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-42359?
Upgrade to Airflow 3.2.2+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated XCom writer can bypass PATCH validation, causing RCE on the triggerer during task deferral.
Immediate action required
- affected>= 3.2.0 and < 3.2.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.