CVE-2026-48831
Published: 24 May 2026
Summary
CVE-2026-48831 is a high-severity Incorrect Resource Transfer Between Spheres (CWE-669) vulnerability in Winehq (inferred from references). Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Malicious File (T1204.002); ranked at the 6.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-31599
Vulnerability details
Wine ships a .desktop file that registers itself as a MIME handler for EXE files and several other Windows executable file types. In some configurations, handling of an EXE file causes that file to be blindly executed with the permissions…
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of the invoker. This allows escaping Flatpak and Snap sandboxes, because MIME handlers are not intended for use by code interpreters and loaders. NOTE: some parties feel that this is not a bug to be addressed in Wine, because there is no known solution that avoids a severe loss of usability (Wine could be a binfmt-misc handler, but binfmt-misc does not exist on all platforms supported by Wine).
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vuln enables direct execution of malicious EXE via registered MIME handler (T1204.002) and explicit sandbox escape from Flatpak/Snap (T1611).
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Enforces proper authorization rules for any resource or data transfer between different spheres.
Accountability, documentation, and protection requirements ensure correct transfer of media resources between spheres.
Reduces incorrect transfers between spheres by establishing clear, separate domains for different sensitivities or functions.
It governs all resource transfers between spheres, preventing incorrect or unauthorized movement of data or capabilities across domain interfaces.
Addresses incorrect transfer of resources to an uncontrolled sphere by requiring approved destruction or sanitization methods.