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Advisory record · GHSA-2943-9672-r45w

A bug in `BaseSerialization.deserialize()` allowed unrestricted `import_string()` of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embe...

CVSS 9.8 CriticalCriticalEPSS 0.016 · 76th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 7 Jul 2026, 10:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
apache-airflowPyPI<3.3.03.3.0
Identifiers
GHSA-2943-9672-r45w · BIT-airflow-2026-33264 · CVE-2026-33264 · PYSEC-2026-2082
Weakness (CWE)
CWE-502
Tags
Published
7 Jul 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Apache Airflow (apache-airflow) versions before 3.3.0 are vulnerable. A DAG author who embeds a malicious trigger in a DAG can get remote code execution on the Scheduler or API Server process, because deserialization imported attacker-chosen class paths without restriction. Upgrade to apache-airflow 3.3.0 or later. As a defense-in-depth measure where DAG author trust is limited, restrict the [core] allowed_deserialization_classes setting to a narrow allowlist.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H OSV
  • CISA KEV Not listed.
  • EPSS 0.016, the 76th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 7 Jul 2026, 09:20 UTC Confirmed by the CVE List
  2. 7 Jul 2026, 10:16 UTC Confirmed by NVD
  3. 31 Oct 2026, 14:10 UTC First seen by agentprime
  4. 31 Oct 2026, 14:10 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.