Apache Airflow: Execution API: set_xcom skips the reserved-key check, so task-written XComs instantiate airflow.* classes on the API server
CVSS score
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Risk score
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Published
1 d ago
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Vulnerability description
DayBreach AI Explanation
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Evidence confidence
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Short explanation
Apache Airflow Task Execution API set_xcom skips the reserved-key check, which can lead to unauthorized class instantiation on the API server [S0].
Because the previous fix for CVE-2026-59242 was incomplete, systems remain affected through this route [S0].
What should be done?
- Upgrade to apache-airflow 3.4.0 or later [S0].
- Review vendor patch references [S0].
Chain of evidence and sources
Apache Airflow Task Execution API, set_xcom fonksiyonunda rezerve anahtar kontrolünü atlamaktadır [S0].
Bu açık, CVE-2026-59242 için uygulanan önceki düzeltmenin eksik kalmasından kaynaklanmaktadır [S0].
Kullanıcılar apache-airflow 3.4.0 veya sonraki sürümlere yükseltme yapmalıdır [S0].
Show the technical text from the sources
Apache Airflow's Task Execution API stored XCom values written by a task without the reserved-key check applied elsewhere, so a Dag author's task could write an XCom that, when a user later viewed it through the API with deserialization enabled, made the API server instantiate classes from the `airflow.*` namespace with arguments the Dag author chose. This is an incomplete fix for CVE-2026-59242: users who applied that fix in apache-airflow 3.3.1 remain affected through this route and should upgrade to apache-airflow 3.4.0 or later.
CWE: CWE-502
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-111421 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Apache Software Foundation | Apache Airflow | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-111421 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-111421 weaknesses.
Official Sources and Advisories
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Weakness Type (CWE & CAPEC)
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