Missing Authentication for Critical Function in Apache Calcite

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2020-13955: 2.15% estimated exploitation activity in the next 30 days; percentile 82.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

"HttpUtils#getURLConnection method disables explicitly hostname verification for HTTPS connections making clients vulnerable to man-in-the-middle attacks. Calcite uses this method internally to connect with Druid and Splunk so information leakage may happen when using the respective Calcite adapters. The method itself is in a utility class so people may use it to create vulnerable HTTPS connections for other applications. From Apache Calcite 1.26 onwards, the hostname verification will be performed using the default JVM truststore."

Published by the source

22 Apr 2021, 16:14 UTC

Last modified by the source

1 Feb 2023, 05:05 UTC

Source last checked

26 Oct 2026, 16:06 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-hxp5-8pgq-mgv9

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# Patch Next advisory brief: CVE-2020-13955

Advisory: Missing Authentication for Critical Function in Apache Calcite
IDs: CVE-2020-13955, GHSA-hxp5-8pgq-mgv9
Record: https://patchnext.com/advisories/cve-2020-13955 (revision 1, source checked 26 Oct 2026, 16:06 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.calcite:calcite-druid 1.26.0; org.apache.calcite:calcite-core 1.26.0; org.apache.calcite:calcite-splunk 1.26.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.calcite:calcite-druid: affected < 1.26.0; fixed in 1.26.0
- Maven org.apache.calcite:calcite-core: affected < 1.26.0; fixed in 1.26.0
- Maven org.apache.calcite:calcite-splunk: affected < 1.26.0; fixed in 1.26.0

## Suggested inspection (read-only)
- Maven org.apache.calcite:calcite-druid: check the installed version with your package manager.
- Maven org.apache.calcite:calcite-core: check the installed version with your package manager.
- Maven org.apache.calcite:calcite-splunk: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.calcite:calcite-druid, org.apache.calcite:calcite-core, org.apache.calcite:calcite-splunk.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hxp5-8pgq-mgv9 (GitHub-reviewed advisory GHSA-hxp5-8pgq-mgv9 lists affected ranges: Maven org.apache.calcite:calcite-core >=0 =0 =0 <1.26.0)

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