How severe is CVE-2026-33858?

CVE-2026-33858 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33858?

CVE-2026-33858 affects Apache Airflow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33858?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33858 have an EU (EUVD) identifier?

Yes. CVE-2026-33858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21978.

When was CVE-2026-33858 published?

CVE-2026-33858 was published on 2026-04-13 and last updated on 2026-06-17.

CVE-2026-33858

CVE-2026-33858 is a high-severity vulnerability in Apache Airflow with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21978
Weakness: CWE-502
Affected product: Apache Airflow
Published: 2026-04-13
Last modified: 2026-06-17

Description

Dag Authors, who normally should not be able to execute code in the webserver context could craft XCom payload causing the webserver to execute arbitrary code. Since Dag Authors are already highly trusted, severity of this issue is Low. Users are recommended to upgrade to Apache Airflow 3.2.0, which resolves this issue.

Frequently asked questions

What is CVE-2026-33858?: Dag Authors, who normally should not be able to execute code in the webserver context could craft XCom payload causing the webserver to execute arbitrary code. Since Dag Authors are already highly trusted, severity of this issue is Low. Users are recommended to upgrade to Apache Airflow 3.2.0, which resolves this issue.
How severe is CVE-2026-33858?: CVE-2026-33858 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33858?: CVE-2026-33858 affects Apache Airflow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33858 have an EU (EUVD) identifier?: Yes. CVE-2026-33858 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21978.
When was CVE-2026-33858 published?: CVE-2026-33858 was published on 2026-04-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*

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