Apache Airflow's Task Execution API stored XCom values written by a task without the reserved-key check applied
Source GCVE Database
Mentioned vulnerabilities
Not known to be exploited : upgrade to 3.4.0 soon.
Data as of 9 Nov 2026, 13:33 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in 3.4.0
Exploitation evidence
Disclosed: evidence found.
CVE published 9 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
Upgrade Apache Airflow and apache-airflow-core to 3.4.0.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Apache Airflowapache-airflow-core | Affected
| Fixed in
|
PyPIapache-airflow-corepkg:pypi/apache-airflow-coreOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users who applied the fix in Apache Airflow 3.3.1 remain vulnerable through this attack vector and should upgrade to Apache Airflow 3.4.0 or later, where the issue is fully addressed. No other mitigation or temporary workaround is indicated.
Description
Apache Airflow's Task Execution API allowed tasks to store XCom values without enforcing the reserved-key check, enabling a DAG author to write XComs that could cause the API server to instantiate classes from the airflow namespace with attacker-controlled arguments when deserialized. This vulnerability is a partial bypass of the fix for CVE-2026-59242, affecting users who applied the fix in version 3.3.1. Users should upgrade to version 3.4.0 or later to fully remediate the issue.
References
- nvd.nist.gov/vuln/detail/CVE-2026-111421 (opens in a new tab)
- github.com/apache/airflow/pull/72718 (opens in a new tab)
- github.com/apache/airflow/pull/74829 (opens in a new tab)
- lists.apache.org/thread.html/pwdwx354tv0x3m8wzfhh59r6wyztj2lk (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-59242 (opens in a new tab)