CVE-2026-111421: Apache Airflow · Deserialization of Untrusted Data
Affects Apache AirflowSource CVE Database V5
Mentioned vulnerabilities
Not known to be exploited : upgrade to 3.4.0 soon.
Data as of 9 Nov 2026, 09:34 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 8 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
Upgrade Apache Airflow to version 3.4.0 or later, where this vulnerability is fixed. Users who applied the fix for CVE-2026-59242 in version 3.3.1 remain vulnerable and must upgrade to 3.4.0 to fully remediate this issue. No other mitigations are indicated in the vendor advisory.
Description
Apache Airflow versions 3.0.0 through 3.3.x have a deserialization vulnerability in the Task Execution API related to XCom values. The API stored XCom values without applying a reserved-key check, allowing a DAG author's task to write an XCom that could cause the API server to instantiate classes from the airflow.* namespace with attacker-controlled arguments when deserialization is enabled. This issue is a partial fix bypass of CVE-2026-59242 and is resolved in Apache Airflow 3.4.0.