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: 0.8%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.4MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.8%
EPSS %ILE
54th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 12, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
Patch available. 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.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
apache-airflow1.10.0 ... 3.3.1rc2 (297 versions)
  • every version up to 3.3.1: fixed in 3.3.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 71× 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 140 total refreshes for this CVE.

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

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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 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 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-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?
A fix for CVE-2026-59242 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59242 are linked in the Vendor Advisories panel on this page.

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