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
9.8EG
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(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
59%
KEV
Not listed

Published

July 7, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jul 26, 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 20× 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. 2026-07-27 10:15 UTCGHSA enrichment
  2. 2026-07-27 06:04 UTCGHSA enrichment
  3. 2026-07-27 01:14 UTCGHSA enrichment
  4. 2026-07-26 21:03 UTCGHSA enrichment
  5. 2026-07-26 16:53 UTCEG score recompute
  6. 2026-07-26 16:53 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 12:42 UTCEG score recompute
  10. 2026-07-26 12:42 UTCGHSA enrichment
  11. 2026-07-25 14:18 UTCEPSS rescore
  12. 2026-07-25 14:18 UTCEPSS rescore
  13. 2026-07-24 14:17 UTCEPSS rescore
  14. 2026-07-24 14:17 UTCEPSS rescore
  15. 2026-07-23 14:18 UTCEPSS rescore
  16. 2026-07-23 14:18 UTCEPSS rescore
  17. 2026-07-23 03:09 UTCEG score recompute
  18. 2026-07-22 14:08 UTCEPSS rescore
  19. 2026-07-21 15:24 UTCEPSS rescore
  20. 2026-07-20 17:08 UTCEPSS rescore
  21. 2026-07-19 14:31 UTCEPSS rescore
  22. 2026-07-19 02:29 UTCEPSS rescore
  23. 2026-07-18 10:04 UTCEPSS rescore
  24. 2026-07-17 03:54 UTCGHSA enrichment
  25. 2026-07-16 23:43 UTCGHSA enrichment
Show 57 more
  1. 2026-07-16 19:33 UTCGHSA enrichment
  2. 2026-07-16 17:03 UTCEPSS rescore
  3. 2026-07-16 14:55 UTCGHSA enrichment
  4. 2026-07-16 10:45 UTCGHSA enrichment
  5. 2026-07-16 06:25 UTCGHSA enrichment
  6. 2026-07-16 02:13 UTCGHSA enrichment
  7. 2026-07-15 22:02 UTCGHSA enrichment
  8. 2026-07-15 17:49 UTCGHSA enrichment
  9. 2026-07-15 16:57 UTCEPSS rescore
  10. 2026-07-15 16:57 UTCEPSS rescore
  11. 2026-07-15 13:35 UTCGHSA enrichment
  12. 2026-07-15 09:21 UTCGHSA enrichment
  13. 2026-07-15 05:10 UTCGHSA enrichment
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-15 02:00 UTCEPSS rescore
  16. 2026-07-15 00:59 UTCGHSA enrichment
  17. 2026-07-14 20:48 UTCGHSA enrichment
  18. 2026-07-14 16:37 UTCGHSA enrichment
  19. 2026-07-14 12:26 UTCGHSA enrichment
  20. 2026-07-14 08:16 UTCGHSA enrichment
  21. 2026-07-14 04:03 UTCGHSA enrichment
  22. 2026-07-13 23:51 UTCGHSA enrichment
  23. 2026-07-13 22:30 UTCEPSS rescore
  24. 2026-07-13 19:41 UTCGHSA enrichment
  25. 2026-07-13 15:30 UTCGHSA enrichment
  26. 2026-07-13 11:18 UTCGHSA enrichment
  27. 2026-07-13 07:08 UTCGHSA enrichment
  28. 2026-07-13 06:13 UTCEPSS rescore
  29. 2026-07-13 06:13 UTCEPSS rescore
  30. 2026-07-13 02:56 UTCGHSA enrichment
  31. 2026-07-12 22:45 UTCGHSA enrichment
  32. 2026-07-12 18:34 UTCGHSA enrichment
  33. 2026-07-12 14:22 UTCGHSA enrichment
  34. 2026-07-12 10:11 UTCGHSA enrichment
  35. 2026-07-12 06:00 UTCGHSA enrichment
  36. 2026-07-12 05:46 UTCEPSS rescore
  37. 2026-07-12 01:49 UTCGHSA enrichment
  38. 2026-07-11 21:39 UTCGHSA enrichment
  39. 2026-07-11 17:28 UTCGHSA enrichment
  40. 2026-07-11 13:18 UTCGHSA enrichment
  41. 2026-07-11 09:07 UTCGHSA enrichment
  42. 2026-07-11 08:27 UTCEPSS rescore
  43. 2026-07-11 04:56 UTCGHSA enrichment
  44. 2026-07-11 00:45 UTCGHSA enrichment
  45. 2026-07-10 20:34 UTCGHSA enrichment
  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 1% probability of exploitation in the next 30 days, which ranks it in the top 41.0% 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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