CVE-2026-42359

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-01. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated Jun 2, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic
https://www.cve.org/CVERecord?id=CVE-2026-33858
generic
https://lists.apache.org/thread/g8dqykpf1p90tysq8tln4qtkqwb1038s
github_pr

Apply reserved-key check to XCom update payload

Fix merged in apache/airflow PR #65915 on 2026-05-07 — awaiting tagged release

https://github.com/apache/airflow/pull/65915

Vendor Advisories for CVE-2026-42359(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
apache-airflow3.2.0 ... 3.2.2rc3 (8 versions)3.2.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 188 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 06:11 UTCEG score recompute
  3. 2026-09-13 16:47 UTCEPSS rescore
  4. 2026-09-13 01:06 UTCOSV refresh
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  21. 2026-08-25 03:58 UTCEG score recompute
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  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 14:53 UTCEG score recompute
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  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 10:20 UTCEG score recompute
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-18 13:48 UTCEPSS rescore
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  6. 2026-08-16 16:44 UTCEG score recompute
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  17. 2026-08-11 13:43 UTCEPSS rescore
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  20. 2026-08-09 22:58 UTCEG score recompute
  21. 2026-08-09 13:46 UTCEPSS rescore
  22. 2026-08-08 22:17 UTCEG score recompute
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-07 21:44 UTCEG score recompute
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  26. 2026-08-06 13:46 UTCEPSS rescore
  27. 2026-08-05 20:40 UTCEG score recompute
  28. 2026-08-05 19:17 UTCEPSS rescore
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  30. 2026-08-04 15:10 UTCEPSS rescore
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  39. 2026-07-30 16:28 UTCEPSS rescore
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  41. 2026-07-29 11:18 UTCEG score recompute
  42. 2026-07-28 15:36 UTCEPSS rescore
  43. 2026-07-28 03:55 UTCEG score recompute
  44. 2026-07-27 14:13 UTCEPSS rescore
  45. 2026-07-27 02:06 UTCEG score recompute
  46. 2026-07-26 14:54 UTCEPSS rescore
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  48. 2026-07-25 14:18 UTCEPSS rescore
  49. 2026-07-24 14:17 UTCEPSS rescore
  50. 2026-07-23 14:18 UTCEPSS rescore
  51. 2026-07-23 03:11 UTCEG score recompute
  52. 2026-07-22 14:08 UTCEPSS rescore
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  54. 2026-07-20 17:08 UTCEPSS rescore
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  64. 2026-07-11 08:27 UTCEPSS rescore
  65. 2026-07-09 19:10 UTCEPSS rescore
  66. 2026-07-08 17:06 UTCGHSA enrichment
  67. 2026-07-08 15:15 UTCEPSS rescore
  68. 2026-07-07 13:46 UTCEPSS rescore
  69. 2026-07-06 16:27 UTCEPSS rescore
  70. 2026-07-06 16:27 UTCEPSS rescore
  71. 2026-07-06 02:23 UTCEPSS rescore
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  73. 2026-07-05 02:30 UTCEPSS rescore
  74. 2026-07-04 06:31 UTCEPSS rescore
  75. 2026-07-02 15:47 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42359?
CVE-2026-42359 is a high vulnerability published on June 1, 2026. 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. returnvalue) that the matching POST endpoint already validated against FORBIDDENXCOMKEYS. The…
When was CVE-2026-42359 disclosed?
CVE-2026-42359 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42359 actively exploited?
CVE-2026-42359 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.5% of all scored CVEs.
What is the CVSS score of CVE-2026-42359?
CVE-2026-42359 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42359?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42359, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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