mailcap: A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu
CVE-2026-10037 is fixed in mailcap on 1 platform, first by mailcap 3.75ubuntu1.1, released July 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu. The .jar MIME handlers installed by these packages execute files marked as executable when the mailcap package is installed. A compromised or malicious sandboxed application with access to the OpenURI portal via xdg-desktop-portal-gtk can write a malicious .jar file to the host file system, set its executable bit, and trigger the handler to execute arbitrary code outside of the sandbox environment.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mailcap · Ubuntu 22.04.1 LTS (jammy) | 3.70+nmu1ubuntu1.22.04.1 | mailcap 3.70+nmu1ubuntu1.22.04.1 | Jul 9, 2026 |
| mailcap · Ubuntu 24.04.5 LTS (noble) | 3.70+nmu1ubuntu1.24.04.1 | mailcap 3.70+nmu1ubuntu1.24.04.1 | Jul 9, 2026 |
| mailcap · Ubuntu 25.10 (questing) | 3.74ubuntu1.1 | mailcap 3.74ubuntu1.1 | Jul 9, 2026 |
| mailcap · Ubuntu 26.04.1 LTS (resolute) | 3.75ubuntu1.1 | mailcap 3.75ubuntu1.1 | Jul 8, 2026 |
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