CVE-2026-42359

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.

Overview

State: PUBLISHED
Assigner (CNA): apache
CVSS severity: high
CVSS score: 8.8 / 10
CVSS vector: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Effective score: 8.8 / 10 HIGH source: CNA overview
CWE(s): CWE-502
Reserved: 2026-04-26
Published: 2026-06-01 07:49 UTC
Last updated: 2026-06-02 13:03 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/42xxx/CVE-2026-42359.json
Linked Threat: CVE-2026-42359 — CVE-2026-42359

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-06-01 09:16:18 UTC
NVD last modified: 2026-06-17 10:47:44 UTC
NVD CVSS v3.1: 8.8 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 2.8 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0055 (probability of exploitation in next 30 days)
EPSS percentile: 41.95% vs all CVEs — higher = more likely to be exploited, as of 2026-07-02

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-33588
Assigner: apache
Published: Jun 1, 2026, 7:49:17 AM
Updated: Jun 2, 2026, 1:03:40 PM
EUVD base score (CVSS 3.1): 8.8 / 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.5700
Vendors: Apache Software Foundation
Products: Apache Airflow (3.2.0 <3.2.2)
Aliases: GHSA-wr76-29cr-67w8

ENISA 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
Apache Software Foundation	Apache Airflow	`3.2.0` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/apache/airflow/pull/65915 patch
https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s vendor-advisory
https://www.cve.org/CVERecord?id=CVE-2026-33858 related

Web references (6)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://github.com/apache/airflow/pull/65915 tenable:github.com
https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s tenable:lists.apache.org
https://nvd.nist.gov/vuln/detail/CVE-2026-42359 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-33858 tenable:www.cve.org
https://www.cve.org/CVERecord?id=CVE-2026-42359 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/apache/airflow/pull/65915 security@apache.org Issue TrackingPatch
https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s security@apache.org Mailing ListVendor Advisory
https://www.cve.org/CVERecord?id=CVE-2026-33858 security@apache.org Third Party Advisory

Remediations (15)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

April 2026 Critical Patch Update Released | security - Oracle Blogs

web:blogs.oracle.com

For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-06-08 15:51 UTC
Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...

web:cybersecuritynews.com

Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

2026-06-08 15:51 UTC
Oracle Patch 38632161: Step-by-Step Guide to Upgrade Oracle 19c to ...

web:dbainsight.com

Learn how to apply Oracle Patch 38632161 to upgrade Oracle Database 19c to Release Update 19.30. This step-by-step DBA guide covers OPatch upgrade, conflict checks, patching, and datapatch validation.

2026-06-08 15:51 UTC
Nvd - Cve-2026-42359

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-06-08 15:51 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-06-08 15:51 UTC
May 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.

2026-06-08 15:51 UTC
Oracle Patches 450 Vulnerabilities With April 2026 CPU

web:www.securityweek.com

Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication.

2026-06-08 15:51 UTC
Oracle April 2026 Critical Patch Update 241 CVEs | Tenable®

web:www.tenable.com

Oracle addresses 241 CVEs in its April Critical Patch Update, the second quarterly update of 2026 with 481 patches, including 34 critical updates.

2026-06-08 15:51 UTC
Windows 11 April 2026 Update tested: What's new, improved and fixed

web:www.windowslatest.com

Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

2026-06-08 15:51 UTC
Patch Tuesday June 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-06-08 15:51 UTC
Windows 11, version 25H2 known issues and notifications

web:learn.microsoft.com

Windows 11, version 25H2 is now available for all eligible devices. Devices running Home and Pro editions of Windows 11 that are not managed by IT departments will receive the update to Windows 11, version 25H2 through the machine learning-based intelligent rollout.

2026-06-19 02:32 UTC
Oracle CPU April 2026: Delayed RUs & First Analysis ¶

web:oradba.ch

On April 21, 2026 , Oracle released the Critical Patch Update (CPU) for April 2026 — 481 new security fixes across the entire Oracle product stack. For Oracle Database, this means another round of mandatory patching. What makes this quarter unusual: several key Release Updates, including 19.31 and 23.26.2, were not available on release day and are delayed by up to a week or more.

2026-06-19 02:32 UTC
Microsoft is working on a patch for 'YellowKey ... - Computerworld

web:www.computerworld.com

Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...

2026-06-19 02:32 UTC
Critical Patch Updates, Critical Security Patch Updates ... - Oracle

web:www.oracle.com

Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.

2026-06-19 02:32 UTC
Oracle's Second Monthly Security Updates Deliver 245 Patches

web:www.securityweek.com

Vulnerabilities Oracle's Second Monthly Security Updates Deliver 245 Patches Oracle has released its June 2026 Critical Security Patch Update to fix vulnerabilities in Communications, EBS, Enterprise Manager and other products.

2026-06-19 02:32 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-42359.json.

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