CVE-2026-33264

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM 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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 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(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

July 7, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Sep 6, 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.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
apache-airflow1.10.0 ... 3.3.0rc2 (294 versions)3.3.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 123× 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 330 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 1% probability of exploitation in the next 30 days, which ranks it in the top 38.3% of all scored CVEs.
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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