CVE-2026-59242

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH 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(high)
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
45%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 14, 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 20× 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.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 19:20 UTCGHSA enrichment
  3. 2026-08-19 19:18 UTCEG score recompute
  4. 2026-08-19 19:18 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-18 19:16 UTCEG score recompute
  7. 2026-08-18 19:16 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 19:14 UTCEG score recompute
  10. 2026-08-17 19:14 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 18:49 UTCEG score recompute
  13. 2026-08-16 18:49 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 18:37 UTCEG score recompute
  17. 2026-08-15 18:37 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 18:35 UTCEG score recompute
  20. 2026-08-14 18:35 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 21:03 UTCGHSA enrichment
  23. 2026-08-12 21:01 UTCEG score recompute
  24. 2026-08-12 21:01 UTCGHSA enrichment
  25. 2026-08-12 17:06 UTCEG score recompute▲ 5.40
Show 5 more
  1. 2026-08-12 17:05 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  2. 2026-08-12 16:40 UTCMITRE cvelistV5
  3. 2026-08-12 16:33 UTCNVD update
  4. 2026-08-12 16:01 UTCEG score recompute
  5. 2026-08-12 16:00 UTCMITRE cvelistV5first tracked

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 August 14, 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 54.6% 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.

Dependency Blast Radius

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