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MEDIUM

CVE-2021-26920

CVSS v3

6.5

MEDIUM

EPSS Score

9.5 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • fast-xml-parsernpmall versions · fixed in 4.1.2
  • org.apache.druid:druid-coreMavenall versions · fixed in 0.21.0

Vendor advisories

  • CVE-2021-26920 Red Hat Product Security

    druid: HTTP InputSource allows authenticated users to read data from other sources

Full record on NVD

Description

In the Druid ingestion system, the InputSource is used for reading data from a certain data source. However, the HTTP InputSource allows authenticated users to read data from other sources than intended, such as the local file system, with the privileges of the Druid server process. This is not an elevation of privilege when users access Druid directly, since Druid also provides the Local InputSource, which allows the same level of access. But it is problematic when users interact with Druid indirectly through an application that allows users to specify the HTTP InputSource, but not the Local InputSource. In this case, users could bypass the application-level restriction by passing a file URL to the HTTP InputSource.

Technical details

Published
2021-07-02

Frequently asked questions

What is CVE-2021-26920?

In the Druid ingestion system, the InputSource is used for reading data from a certain data source. However, the HTTP InputSource allows authenticated users to read data from other sources than intended, such as the local file system, with the privileges of the Druid server process. This is not an elevation of privilege when users access Druid directly, since Druid also provides the Local InputSource, which allows the same level of access. But it is problematic when users interact with Druid indirectly through an application that allows users to specify the HTTP InputSource, but not the Local InputSource. In this case, users could bypass the application-level restriction by passing a file URL to the HTTP InputSource.

Is CVE-2021-26920 actively exploited?

Active exploitation of CVE-2021-26920 has not been confirmed. Its EPSS score was 9.5% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-26920?

CVE-2021-26920 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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