CVE-2026-33264

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

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

A bug in BaseSerialization.deserialize() allowed unrestricted import_string() of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process, crossing the Airflow security boundary that DAG-author code must never execute in those processes. Users are advised to upgrade to apache-airflow 3.3.0 or later. As a defense-in-depth mitigation, deployments where DAG-author trust is limited can restrict the [core] allowed_deserialization_classes config to a narrow allowlist.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
73.8%
KEV
Not listed

Published

July 7, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

oss-security - CVE-2026-33264: Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()

http://www.openwall.com/lists/oss-security/2026/07/07/1
generic
https://lists.apache.org/thread/otvdw8qt2y7xy2n5nq9xby9ky4rf5ltj
github_pr

Remove dead AIP-44 trigger-over-BaseSerialization path (DAT.BASE_TRIGGER)

Fix merged in apache/airflow PR #68528 on 2026-06-17 — awaiting tagged release

https://github.com/apache/airflow/pull/68528
github_pr

Do not deserialize trigger_kwargs when loading serialized DAGs

Fix merged in apache/airflow PR #66002 on 2026-05-07 — awaiting tagged release

https://github.com/apache/airflow/pull/66002

Vendor Advisories for CVE-2026-33264(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 74× in last 7d / 82× 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. 2026-07-15 22:02 UTCEG score recompute
  2. 2026-07-15 22:02 UTCGHSA enrichment
  3. 2026-07-15 17:49 UTCEG score recompute
  4. 2026-07-15 17:49 UTCGHSA enrichment
  5. 2026-07-15 16:57 UTCEPSS rescore
  6. 2026-07-15 16:57 UTCEPSS rescore
  7. 2026-07-15 13:35 UTCEG score recompute
  8. 2026-07-15 13:35 UTCGHSA enrichment
  9. 2026-07-15 09:21 UTCEG score recompute
  10. 2026-07-15 09:21 UTCGHSA enrichment
  11. 2026-07-15 05:10 UTCEG score recompute
  12. 2026-07-15 05:10 UTCGHSA enrichment
  13. 2026-07-15 02:00 UTCEPSS rescore
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-15 00:59 UTCEG score recompute
  16. 2026-07-15 00:59 UTCGHSA enrichment
  17. 2026-07-14 20:48 UTCEG score recompute
  18. 2026-07-14 20:48 UTCGHSA enrichment
  19. 2026-07-14 16:38 UTCEG score recompute
  20. 2026-07-14 16:37 UTCGHSA enrichment
  21. 2026-07-14 12:26 UTCEG score recompute
  22. 2026-07-14 12:26 UTCGHSA enrichment
  23. 2026-07-14 08:16 UTCEG score recompute
  24. 2026-07-14 08:16 UTCGHSA enrichment
  25. 2026-07-14 04:03 UTCEG score recompute
Show 57 more
  1. 2026-07-14 04:03 UTCGHSA enrichment
  2. 2026-07-13 23:51 UTCEG score recompute
  3. 2026-07-13 23:51 UTCGHSA enrichment
  4. 2026-07-13 22:30 UTCEPSS rescore
  5. 2026-07-13 19:41 UTCEG score recompute
  6. 2026-07-13 19:41 UTCGHSA enrichment
  7. 2026-07-13 15:30 UTCEG score recompute
  8. 2026-07-13 15:30 UTCGHSA enrichment
  9. 2026-07-13 11:18 UTCEG score recompute
  10. 2026-07-13 11:18 UTCGHSA enrichment
  11. 2026-07-13 07:08 UTCEG score recompute
  12. 2026-07-13 07:08 UTCGHSA enrichment
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-13 06:13 UTCEPSS rescore
  15. 2026-07-13 02:56 UTCEG score recompute
  16. 2026-07-13 02:56 UTCGHSA enrichment
  17. 2026-07-12 22:45 UTCEG score recompute
  18. 2026-07-12 22:45 UTCGHSA enrichment
  19. 2026-07-12 18:34 UTCEG score recompute
  20. 2026-07-12 18:34 UTCGHSA enrichment
  21. 2026-07-12 14:22 UTCEG score recompute
  22. 2026-07-12 14:22 UTCGHSA enrichment
  23. 2026-07-12 10:11 UTCEG score recompute
  24. 2026-07-12 10:11 UTCGHSA enrichment
  25. 2026-07-12 06:00 UTCEG score recompute
  26. 2026-07-12 06:00 UTCGHSA enrichment
  27. 2026-07-12 05:46 UTCEPSS rescore
  28. 2026-07-12 01:50 UTCEG score recompute
  29. 2026-07-12 01:49 UTCGHSA enrichment
  30. 2026-07-11 21:39 UTCEG score recompute
  31. 2026-07-11 21:39 UTCGHSA enrichment
  32. 2026-07-11 17:28 UTCEG score recompute
  33. 2026-07-11 17:28 UTCGHSA enrichment
  34. 2026-07-11 13:18 UTCEG score recompute
  35. 2026-07-11 13:18 UTCGHSA enrichment
  36. 2026-07-11 09:07 UTCEG score recompute
  37. 2026-07-11 09:07 UTCGHSA enrichment
  38. 2026-07-11 08:27 UTCEPSS rescore
  39. 2026-07-11 04:56 UTCEG score recompute
  40. 2026-07-11 04:56 UTCGHSA enrichment
  41. 2026-07-11 00:45 UTCEG score recompute
  42. 2026-07-11 00:45 UTCGHSA enrichment
  43. 2026-07-10 20:35 UTCEG score recompute
  44. 2026-07-10 20:34 UTCGHSA enrichment
  45. 2026-07-10 16:23 UTCEG score recompute
  46. 2026-07-10 16:23 UTCGHSA enrichment
  47. 2026-07-10 12:13 UTCEG score recompute▲ 9.80
  48. 2026-07-10 12:12 UTCGHSA enrichment
  49. 2026-07-09 19:10 UTCEPSS rescore
  50. 2026-07-08 15:15 UTCEPSS rescore
  51. 2026-07-07 15:51 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  52. 2026-07-07 14:17 UTCNVD update
  53. 2026-07-07 13:46 UTCEPSS rescore
  54. 2026-07-07 13:06 UTCMITRE cvelistV5
  55. 2026-07-07 11:56 UTCNVD update
  56. 2026-07-07 10:06 UTCEG score recompute
  57. 2026-07-07 10:06 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-33264?
CVE-2026-33264 is a critical vulnerability published on July 7, 2026. A bug in BaseSerialization.deserialize() allowed unrestricted importstring() of attacker-controlled class paths when the Scheduler / API Server loaded a serialized DAG: a DAG author could embed a malicious trigger into a DAG to gain remote code execution on the API Server / Scheduler process,…
When was CVE-2026-33264 disclosed?
CVE-2026-33264 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33264 actively exploited?
CVE-2026-33264 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 73.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33264?
CVE-2026-33264 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-33264?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33264, 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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