CVE-2026-48831
CVE-2026-48831 is a high-severity vulnerability with a CVSS 4.0 base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-669.
Key facts
- Severity: High (CVSS 4.0 base score 7.3)
- EPSS exploit prediction: 0% (8th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31599
- Weakness: CWE-669
- Published:
- Last modified:
Description
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 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).
Frequently asked questions
- What is CVE-2026-48831?
- 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 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).
- How severe is CVE-2026-48831?
- CVE-2026-48831 has a CVSS 4.0 base score of 7.3, rated high severity.
- Is CVE-2026-48831 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-48831?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-48831 have an EU (EUVD) identifier?
- Yes. CVE-2026-48831 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31599.
- When was CVE-2026-48831 published?
- CVE-2026-48831 was published on 2026-05-24 and last updated on 2026-06-17.
References
- https://bugs.winehq.org/show_bug.cgi?id=59767
- https://www.openwall.com/lists/oss-security/2026/05/19/1
- http://www.openwall.com/lists/oss-security/2026/05/25/1
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