CVE-2026-33264

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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 (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory

Also known asEUVD-2026-42030 (ENISA EUVD) · GHSA-2943-9672-r45w (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.6%
EPSS %ILE
76th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 7, 2026

Last Modified

October 25, 2026

Advisory Details (4)

Auto-updated Oct 26, 2026
Patch available. Sources: github_pr.
Web page

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
GitHub pull request

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 pull request

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 rangeFix by version rangeDependents
apache-airflow1.10.0 ... 3.3.0rc2 (294 versions)
  • every version up to 3.3.0: fixed in 3.3.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 49× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 392 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 295 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  2. 2026-10-26 23:51 UTCEG score recompute
  3. 2026-10-26 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  4. 2026-10-25 18:01 UTCEG score recompute
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  6. 2026-10-25 14:35 UTCEG score recompute
  7. 2026-10-24 17:39 UTCEG score recompute
  8. 2026-10-24 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  9. 2026-10-23 17:50 UTCEG score recompute
  10. 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  11. 2026-10-22 18:00 UTCEG score recompute
  12. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  13. 2026-10-21 18:04 UTCEG score recompute
  14. 2026-10-21 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  15. 2026-10-20 18:13 UTCEG score recompute
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  17. 2026-10-19 18:22 UTCEG score recompute
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  19. 2026-10-18 18:32 UTCEG score recompute
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  21. 2026-10-18 03:47 UTCEG score recompute
  22. 2026-10-17 18:42 UTCEG score recompute
  23. 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  24. 2026-10-16 18:51 UTCEG score recompute
  25. 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.6% · 76th percentile
Show 72 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  2. 2026-10-15 15:52 UTCEG score recompute
  3. 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.6% · 76th percentile
  4. 2026-10-14 10:05 UTCEG score recompute
  5. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  6. 2026-10-13 08:19 UTCEG score recompute
  7. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  8. 2026-10-12 16:13 UTCEG score recompute
  9. 2026-10-11 19:55 UTCEG score recompute
  10. 2026-10-11 17:09 UTCEG score recompute
  11. 2026-10-11 14:36 UTCEG score recompute
  12. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  15. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  16. 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  17. 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  18. 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  20. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  21. 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  24. 2026-09-28 13:38 UTCEG score recompute
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  26. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  27. 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  28. 2026-09-23 06:19 UTCEG score recompute
  29. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  30. 2026-09-18 05:51 UTCEG score recompute
  31. 2026-09-17 19:30 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
  32. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  33. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  34. 2026-09-15 03:11 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  35. 2026-09-13 16:55 UTCEG score recompute
  36. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  37. 2026-09-13 08:33 UTCEG score recompute
  38. 2026-09-12 15:01 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  39. 2026-09-12 03:45 UTCEG score recompute
  40. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.0% · 61st percentile
  41. 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.6% · 75th percentile
  42. 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  43. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  44. 2026-09-06 14:08 UTCEG score recompute
  45. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  46. 2026-09-05 22:54 UTCEG score recompute
  47. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  48. 2026-09-02 14:11 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  49. 2026-09-01 13:53 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  50. 2026-09-01 04:39 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  51. 2026-08-31 02:02 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-08-30 21:51 UTCEG score recompute
  53. 2026-08-30 21:51 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  55. 2026-08-30 17:14 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-08-30 13:03 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-08-30 07:43 UTCEG score recompute
  58. 2026-08-30 07:43 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  60. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  61. 2026-08-28 02:44 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-08-27 21:56 UTCEG score recompute
  63. 2026-08-27 21:56 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  65. 2026-08-27 02:01 UTCEG score recompute
  66. 2026-08-27 02:01 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  68. 2026-08-26 13:49 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-08-25 14:52 UTCEG score recompute
  70. 2026-08-25 14:52 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.6% · 74th percentile
  72. 2026-08-25 10:20 UTCGHSA enrichmentGHSA-2943-9672-r45w · GitHub severity CRITICAL · GitHub CVSS 9.8

Frequently asked(5)

What is CVE-2026-33264?
CVE-2026-33264 is a critical-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-33264 published?
The CVE record for CVE-2026-33264 was published on July 7, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-33264 actively exploited?
CVE-2026-33264 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (76th percentile of EPSS-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?
A fix for CVE-2026-33264 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33264 are linked in the Vendor Advisories panel on this page.

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