CVE-2026-59242

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-08-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.4Exploit: None knownExposed: 0

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

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.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity54% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

August 12, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic
https://lists.apache.org/thread/dm0520yhh4mn7qknyoh45r2w6c5qg2mg
github_pr

Reject reserved XCom serialization keys submitted as JSON string literals

Fix merged in apache/airflow PR #69378 on 2026-07-06 — awaiting tagged release

https://github.com/apache/airflow/pull/69378

Vendor Advisories for CVE-2026-59242(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 78× 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 111 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59242?
CVE-2026-59242 is a medium vulnerability published on August 12, 2026. Apache Airflow's XCom GET /api/v2/{...}/xcomEntries/{key}?deserialize=true endpoint passed a string-literal payload through BaseXCom.deserializevalue without the checkforbiddenxcom_keys guard, allowing an authenticated API user with XCom write-and-read access to instantiate arbitrary airflow.*…
When was CVE-2026-59242 disclosed?
CVE-2026-59242 was first published in the National Vulnerability Database on August 12, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59242 actively exploited?
CVE-2026-59242 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 53.4% of all scored CVEs.
What is the CVSS score of CVE-2026-59242?
CVE-2026-59242 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-59242?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59242, 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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