CVE-2025-29847 Apache Linkis: Arbitrary File Read via Double URL Encoding Bypass
Attackers can read arbitrary system files by bypassing URL encoding checks in JDBC parameters, affecting Apache Linkis users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-29847?
CVE-2025-29847 is a high-severity path traversal vulnerability in Apache Linkis, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in Apache Linkis.
Problem Description When using the JDBC engine and da When using the JDBC engine and data source functionality, if the URL parameter configured on the frontend has undergone multiple rounds of URL encoding, it may bypass the system's checks. This bypass can trigger a vulnerability that allows unauthorized access to system files via JDBC parameters.
Scope of Impact
This issue affects Apache Linkis: from 1.3.0 through 1.7.0.
Severity level
moderate Solution Continuously check if the connection information contains the "%" character; if it does, perform URL decoding.
Users are recommended to upgrade to version 1.8.0, which fixes the issue.
More questions about this vulnerability can be discussed here: https://lists.apache.org/[email protected]:2025-9:cve
Which versions are affected by CVE-2025-29847?
2 open source packages ship an affected version, including org.apache.linkis:linkis. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.linkis:linkis Maven | From 1.3.0 | 1.8.0 |
org.apache.linkis:linkis Maven | From 1.3.0 | 1.8.0 |
Products include Apache Linkis.
How do I fix CVE-2025-29847?
Upgrade org.apache.linkis:linkis to 1.8.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-29847 being exploited?
There is no known exploitation of CVE-2025-29847 in the wild and no public exploit code.
Other vulnerabilities in Apache Linkis
- CVE-2023-27602 Apache Linkis publicsercice module unrestricted upload of file
- CVE-2023-27603 Apache Linkis Mangaer module engineConn material upload exists Zip Slip issue
- CVE-2023-29215 Apache Linkis JDBC EngineCon has a deserialization command execution
- CVE-2023-29216 Apache Linkis DatasourceManager module has a deserialization command execution
- CVE-2023-27987 Apache Linkis gateway module token authentication bypass
Sources
Also known as GHSA-c399-q49h-qwc8.