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Public proof of conceptAwaiting NVD analysis

CVE-2026-86829

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

A public proof of concept exists; no exploitation attested.

  • Published2026-11-09
  • WeaknessCWE-502

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-0909:52CVE publishedCNA
  2. 2026-11-0910:17CVE publishedNVD
  3. 2026-11-1110:16First public proof of conceptPoC-in-GitHub

Versions per branch

Products declared by the CNA

As apache, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Apache Software Foundation Apache Airflowother versions: not affected

    package apache-airflow-corehttps://pypi.python.org

    Affected
    • < 3.4.0fixed in 3.4.0semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-09

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-86829 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-11 10:17 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-09
Last Modified
2026-11-12
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-xpfh-wwcc-hq9p

Frequently asked questions

What is CVE-2026-86829?

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.

Is CVE-2026-86829 actively exploited?

Active exploitation of CVE-2026-86829 has not been confirmed. Its EPSS score was 0.3% on 2026-11-11, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-86829?

CVE-2026-86829 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record