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  4. CVE 2026 34538 apache airflow authorization bypass in dagrun
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-34538GHSA-R7VR-M4JW-R794

Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure)CVE-2026-34538

Answer in brief

CVE-2026-34538 records a Medium severity (CVSS 6.5) vulnerability in Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure). The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/apache-airflow-core (generic), apache-airflow (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 9, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Jun 11, 2026Material review Nov 3, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-668
Source
CVE List V5
Source checked
Nov 3, 2026
References
7 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/apache-airflow-core (generic), apache-airflow (pip). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/apache-airflow-coregeneric>=3.0.0 <3.2.03.2.0
apache-airflowpip>=3.0.0,<3.2.03.2.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/apache-airflow-core, apache-airflow.
  2. 2Review the reported fix. Update Apache Software Foundation/apache-airflow-core to 3.2.0; apache-airflow to 3.2.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 11, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencelists.apache.org
  • Source referenceopenwall.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with the FAB RBAC model, which treats XCom as a separate protected resource, and with the security model documentation that defines the Viewer role as read-only. Airflow uses the FAB Auth Manager to manage access control on a per-resource basis. The Viewer role is intended to be read-only by default, and the security model documentation defines Viewer users as those who can inspect DAGs without accessing sensitive execution results. Users are recommended to upgrade to Apache Airflow 3.2.0 which resolves this issue.

Quoted source text, attributed separately from HOL analysis.