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VulnerabilityPublished Updated

CVE-2026-59242: Apache Airflow · Deserialization of Untrusted Data

Affects Apache AirflowSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium : upgrade to 3.0.0 when convenient.

Data as of 11 Nov 2026, 23:24 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.15.4
EPSS
0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.0.0, 3.3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade Apache Airflow and apache-airflow to 3.0.0; Apache Airflow and apache-airflow and apache-airflow-core to 3.3.1.

Affected software

ProductAffectedFixed in
Apache Airflowapache-airflowAffected
  • <3.0.0
Fixed in
  • 3.0.0
Apache Airflowapache-airflow-coreAffected
  • >=3.0.0 <3.3.1
Fixed in
  • 3.3.1
PyPIapache-airflowpkg:pypi/apache-airflowOther threatsAffected
  • <3.3.1
Fixed in
  • 3.3.1
PyPIapache-airflowpkg:pypi/apache-airflowOther threatsAffected
  • <3.0.0
Fixed in
  • 3.0.0
PyPIapache-airflow-corepkg:pypi/apache-airflow-coreOther threatsAffected
  • >=3.0.0 <3.3.1
Fixed in
  • 3.3.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade to Apache Airflow version 3.3.1 or later, which includes a fix that rejects reserved XCom serialization keys submitted as JSON string literals. No other mitigation or temporary workaround is indicated.

Description

Apache Airflow's XCom `GET /api/v2/{...}/xcomEntries/{key}?deserialize=true` endpoint passed a string-literal payload through `BaseXCom.deserialize_value` without the `_check_forbidden_xcom_keys` guard, allowing an authenticated API user with XCom write-and-read access to instantiate arbitrary `airflow.*` classes on the API server (CWE-502). An authenticated user who can write an XCom value and then read it back with `deserialize=true` triggers the unsafe instantiation. Users are advised to upgrade to apache-airflow 3.3.1 or later, which rejects reserved XCom serialization keys submitted as JSON string literals.

References

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