DataEase up to 2.10.19 String.toUpperCase case sensitivity

Summaryinfo

A vulnerability categorized as problematic has been discovered in DataEase up to 2.10.19. This affects the function String.toUpperCase. The manipulation results in case sensitivity. This vulnerability is known as CVE-2026-32939. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in DataEase up to 2.10.19. It has been classified as problematic. Affected is the function String.toUpperCase. The manipulation with an unknown input leads to a case sensitivity vulnerability. CWE is classifying the issue as CWE-178. The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

DataEase is an open source data visualization analysis tool. Versions 2.10.19 and below have inconsistent Locale handling between the JDBC URL validation logic and the H2 JDBC engine's internal parsing. DataEase uses String.toUpperCase() without specifying an explicit Locale, causing its security checks to rely on the JVM's default runtime locale, while H2 JDBC always normalizes URLs using Locale.ENGLISH. In Turkish locale environments (tr_TR), Java converts the lowercase letter i to İ (dotted capital I) instead of the standard I, so a malicious parameter like iNIT becomes İNIT in DataEase's filter (bypassing its blacklist) while H2 still correctly interprets it as INIT. This discrepancy allows attackers to smuggle dangerous JDBC parameters past DataEase's security validation, and the issue has been confirmed as exploitable in real DataEase deployment scenarios running under affected regional settings. The issue has been fixed in version 2.10.20.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-32939 since 03/17/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Upgrading to version 2.10.20 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 8f1c21834a620d37dafb3fa24605c059d0a5b80d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• DataEase

Version

• 2.10.0
• 2.10.1
• 2.10.2
• 2.10.3
• 2.10.4
• 2.10.5
• 2.10.6
• 2.10.7
• 2.10.8
• 2.10.9
• 2.10.10
• 2.10.11
• 2.10.12
• 2.10.13
• 2.10.14
• 2.10.15
• 2.10.16
• 2.10.17
• 2.10.18
• 2.10.19

License

• open-source

Website

• Product: https://github.com/dataease/dataease/

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