Is CVE-2026-34538 in the CISA KEV catalog?

No. CVE-2026-34538 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34538?

CVE-2026-34538 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-34538?

CVE-2026-34538 has an EPSS score of 0.69% (48th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34538?

Upgrade airflow to 3.2.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-34538

MEDIUM

6.5

CVSS v3

NVD

Description

Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with the FAB RBAC model, which treats XCom as a separate protected resource, and with the security model documentation that defines the Viewer role as read-only. Airflow uses the FAB Auth Manager to manage access control on a per-resource basis. The Viewer role is intended to be read-only by default, and the security model documentation defines Viewer users as those who can inspect DAGs without accessing sensitive execution results. Users are recommended to upgrade to Apache Airflow 3.2.0 which resolves this issue.

CWE-668

How to fix

Remediation Available

airflowNVD

Affected:>= 3.0.0, < 3.2.0Fixed in:3.2.0CVE-2026-34538derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.69%probability of exploitation in 30 days

48thpercentile

Moderate risk: more likely to be exploited than 48% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Issue Tracking1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-15.