CVE-2026-42359

8.8 HIGH

A bug in Apache Airflow's XCom PATCH endpoint `PATCH /api/v2/xcomEntries/{key}` allowed an authenticated UI/API user with XCom write perm...

Published: 2026-06-01 · Last updated: 2026-06-03

Severity and scoring

CVSS: 8.8 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-502

Affected products

Vendor	Product
apache	airflow

Description

A bug in Apache Airflow's XCom PATCH endpoint `PATCH /api/v2/xcomEntries/{key}` allowed an authenticated UI/API user with XCom write permission on a Dag to set XCom entries under reserved key names (e.g. `return_value`) that the matching POST endpoint already validated against `FORBIDDEN_XCOM_KEYS`. The endpoint also accepted serialized payload shapes the triggerer's deserializer treats as code; combined, this allowed RCE on the triggerer when the affected task next deferred. Affects deployments where untrusted users have XCom write permission on Dags that defer to the triggerer. This is a fix-bypass of CVE-2026-33858: PR #64148 added the `FORBIDDEN_XCOM_KEYS` validator only on the POST/set path; the PATCH path was not covered. Users who already upgraded for CVE-2026-33858 should additionally upgrade to `apache-airflow` 3.2.2 or later to cover the PATCH-path bypass.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42359
[Patch]https://github.com/apache/airflow/pull/65915
[Vendor advisory]https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s
[Other]https://www.cve.org/CVERecord?id=CVE-2026-33858

Related CVEs

Same vendor

CVE-2026-50645 — There is no restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF, which can l... (7.5 HIGH)
CVE-2026-50634 — A vulnerability in Apache CXF's JwsJsonContainerRequestFilter can be exploited to cause CXF to process metadata that was not authenticate... (6.5 MEDIUM)
CVE-2026-50633 — A JNDI Injection vulnerability has been discovered in Apache CXF's JCA integration module, which can allow for code execution, if an atta... (8.1 HIGH)
CVE-2026-50632 — A further incomplete fix for a previous advisory CVE-2026-44417 (Untrusted JMS configuration can lead to RCE) for Apache CXF has been ide... (8.1 HIGH)
CVE-2026-50631 — A race condition in AbstractOAuthDataProvider allows concurrent requests using the same Refresh Token to bypass single-use semantics and ... (7.4 HIGH)

Same CWE

CVE-2026-48853 — Deserialization of Untrusted Data and Allocation of Resources Without Limits or Throttling vulnerabilities in elixir-grpc grpc allow unau...
CVE-2026-9691 — Unauthenticated PHP Object Injection in Integration for ActiveCampaign and Contact Form 7, WPForms, Elementor, Ninja Forms <= 1.1.1 versions (9.8 CRITICAL)
CVE-2026-49781 — Unauthenticated PHP Object Injection in OttoKit <= 1.1.27 versions (9.8 CRITICAL)
CVE-2026-49770 — Unauthenticated PHP Object Injection in WP Travel Engine <= 6.7.12 versions (9.8 CRITICAL)
CVE-2026-49769 — Unauthenticated PHP Object Injection in wpForo Forum <= 3.1.0 versions (9.8 CRITICAL)