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CVE-2026-111421VulnerabilityPublished

Apache Airflow's Task Execution API stored XCom values written by a task without the reserved-key check applied

Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-111421· High

Not known to be exploited : upgrade to 3.4.0 soon.

Data as of 9 Nov 2026, 13:33 UTC

Severity
High

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

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Apache Airflowapache-airflow-coreAffected
  • >=3.0.0 <3.4.0
Fixed in
  • 3.4.0
PyPIapache-airflow-corepkg:pypi/apache-airflow-coreOther threatsAffected
  • >=3.0.0 <3.4.0
Fixed in
  • 3.4.0

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

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