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
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.8Exploit: NoneExposed: 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
—
EPSS
42.6%
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 7× in last 7d / 49× 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 112 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:24 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 02:29 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 17:03 UTCEPSS rescore
  8. 2026-07-15 16:57 UTCEPSS rescore
  9. 2026-07-15 02:00 UTCEPSS rescore
  10. 2026-07-13 22:30 UTCEPSS rescore
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-11 08:27 UTCEPSS rescore
  14. 2026-07-09 19:10 UTCEPSS rescore
  15. 2026-07-08 17:06 UTCGHSA enrichment
  16. 2026-07-08 15:15 UTCEPSS rescore
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-06 16:27 UTCEPSS rescore
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 02:23 UTCEPSS rescore
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-05 02:30 UTCEPSS rescore
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-02 15:47 UTCGHSA enrichment
  25. 2026-07-02 02:31 UTCGHSA enrichment
Show 75 more
  1. 2026-07-01 15:06 UTCEPSS rescore
  2. 2026-07-01 13:06 UTCGHSA enrichment
  3. 2026-07-01 00:50 UTCGHSA enrichment
  4. 2026-06-30 23:22 UTCEPSS rescore
  5. 2026-06-30 00:40 UTCGHSA enrichment
  6. 2026-06-29 14:06 UTCEPSS rescore
  7. 2026-06-29 11:55 UTCGHSA enrichment
  8. 2026-06-28 17:52 UTCGHSA enrichment
  9. 2026-06-28 14:07 UTCEPSS rescore
  10. 2026-06-28 05:23 UTCGHSA enrichment
  11. 2026-06-28 04:56 UTCEPSS rescore
  12. 2026-06-27 17:07 UTCGHSA enrichment
  13. 2026-06-27 04:23 UTCGHSA enrichment
  14. 2026-06-27 03:08 UTCEPSS rescore
  15. 2026-06-26 16:07 UTCGHSA enrichment
  16. 2026-06-26 03:51 UTCGHSA enrichment
  17. 2026-06-25 15:35 UTCGHSA enrichment
  18. 2026-06-25 13:49 UTCEPSS rescore
  19. 2026-06-25 13:49 UTCEPSS rescore
  20. 2026-06-25 03:18 UTCGHSA enrichment
  21. 2026-06-24 15:02 UTCGHSA enrichment
  22. 2026-06-24 14:05 UTCEPSS rescore
  23. 2026-06-24 02:16 UTCGHSA enrichment
  24. 2026-06-23 21:33 UTCEPSS rescore
  25. 2026-06-22 14:25 UTCEPSS rescore
  26. 2026-06-22 14:25 UTCEPSS rescore
  27. 2026-06-21 14:56 UTCEPSS rescore
  28. 2026-06-21 14:56 UTCEPSS rescore
  29. 2026-06-21 01:59 UTCEPSS rescore
  30. 2026-06-19 19:25 UTCEPSS rescore
  31. 2026-06-18 22:29 UTCGHSA enrichment
  32. 2026-06-18 17:52 UTCEPSS rescore
  33. 2026-06-18 17:52 UTCEPSS rescore
  34. 2026-06-18 10:13 UTCGHSA enrichment
  35. 2026-06-17 21:56 UTCGHSA enrichment
  36. 2026-06-17 17:53 UTCEPSS rescore
  37. 2026-06-17 09:40 UTCGHSA enrichment
  38. 2026-06-16 21:23 UTCGHSA enrichment
  39. 2026-06-16 17:52 UTCEPSS rescore
  40. 2026-06-16 09:07 UTCGHSA enrichment
  41. 2026-06-15 20:23 UTCGHSA enrichment
  42. 2026-06-15 17:49 UTCEPSS rescore
  43. 2026-06-15 06:31 UTCGHSA enrichment
  44. 2026-06-14 18:14 UTCGHSA enrichment
  45. 2026-06-14 05:39 UTCGHSA enrichment
  46. 2026-06-13 23:00 UTCEPSS rescore
  47. 2026-06-13 17:18 UTCGHSA enrichment
  48. 2026-06-13 04:30 UTCGHSA enrichment
  49. 2026-06-12 23:12 UTCEPSS rescore
  50. 2026-06-12 23:12 UTCEPSS rescore
  51. 2026-06-12 16:13 UTCGHSA enrichment
  52. 2026-06-12 03:55 UTCGHSA enrichment
  53. 2026-06-11 15:39 UTCGHSA enrichment
  54. 2026-06-11 14:00 UTCEPSS rescore
  55. 2026-06-11 03:06 UTCGHSA enrichment
  56. 2026-06-10 22:18 UTCEPSS rescore
  57. 2026-06-10 14:50 UTCGHSA enrichment
  58. 2026-06-10 13:22 UTCEPSS rescore
  59. 2026-06-10 13:22 UTCEPSS rescore
  60. 2026-06-10 02:34 UTCGHSA enrichment
  61. 2026-06-09 14:18 UTCGHSA enrichment
  62. 2026-06-09 02:03 UTCGHSA enrichment
  63. 2026-06-08 14:17 UTCEPSS rescore
  64. 2026-06-08 14:17 UTCEPSS rescore
  65. 2026-06-08 13:46 UTCGHSA enrichment
  66. 2026-06-08 01:31 UTCGHSA enrichment
  67. 2026-06-07 15:25 UTCEPSS rescore
  68. 2026-06-07 15:25 UTCEPSS rescore
  69. 2026-06-07 13:15 UTCGHSA enrichment
  70. 2026-06-07 00:59 UTCGHSA enrichment
  71. 2026-06-06 13:47 UTCEPSS rescore
  72. 2026-06-06 13:47 UTCEPSS rescore
  73. 2026-06-06 12:43 UTCGHSA enrichment
  74. 2026-06-06 00:26 UTCGHSA enrichment
  75. 2026-06-05 22:47 UTCEPSS rescore

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 42.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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