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CVE-2026-86829

Apache Airflow: Deserialization of task-controlled XCom values in the Scheduler during dependency evaluation

Products / packages Apache Software Foundation Apache Airflow

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 00:05:31 UTC
CISA-ADP · CVSS:3.1 · 8.8
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity

high8.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

Apache Airflow's scheduler deserializes task-controlled XCom values, allowing a DAG author to control data deserialized in the scheduler process. Affected versions are those less than 3.4.0. The scheduler must be evaluating a task dependency that reads a task-written XCom value.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Apache Software Foundation · apache

Apache Airflow

1 range
apache version evidence

Package identity

pkg:pypi/apache-airflow-coreExplore apache-airflow-core →

Identity supplied by apache. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 3.4.0

semver versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

Apache Airflow's scheduler fully deserializes XCom values written by task code while evaluating task dependencies. A Dag author, who controls what a task writes to XCom, therefore controls data that is deserialized inside the scheduler process - a context the Airflow security model reserves for code installed by the Deployment Manager, above the worker-scoped execution capability a Dag author is documented to have. Deployments that treat Dag authors as less trusted than Deployment Managers are affected, and the scheduler must be evaluating a task dependency that reads a task-written XCom value. Users of apache-airflow are recommended to upgrade to version 3.4.0 or later, which restricts dependency evaluation to primitive XCom values.

References

3 sources
apache/airflow · pull request #72718
Patchapache
lists.apache.org/thread.html/2qbt7qnclrlxtg3f1b685533r3mvk9hv
Vendor advisoryapache
www.openwall.com/lists/oss-security/2026/11/09/9
Security advisoryCVE

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-86829

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-502 ↗

CWE-502: Deserialization of Untrusted Data

apache

Related →
Contributing organizations · 3
apache

Assigning organization

2026-11-09
CVE

Additional data publisher

2026-11-09
CISA-ADP

Additional data publisher

2026-11-12

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-86829

    Observed 2026-11-13T09:47:09.319Z · upstream updated 2026-11-12T19:53:43.226Z

    Severity assessment changed

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "score": 8.8
  }
]
    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-12T19:53:28.244272Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]
  2. CVE · CVE-2026-86829

    Observed 2026-11-09T10:21:11.696Z · upstream updated 2026-11-09T10:13:19.317Z

    References changed

    before

    [
  "https://github.com/apache/airflow/pull/72718",
  "https://lists.apache.org/thread.html/2qbt7qnclrlxtg3f1b685533r3mvk9hv"
]

    after

    [
  "https://github.com/apache/airflow/pull/72718",
  "https://lists.apache.org/thread.html/2qbt7qnclrlxtg3f1b685533r3mvk9hv",
  "http://www.openwall.com/lists/oss-security/2026/11/09/9"
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.