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cve recordhigh

CVE-2026-8933

Published
CVSS7.8
Severityhigh
WeaknessCWE-250
ExploitedNot in CISA KEV

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

A local privilege escalation vulnerability exists in snap-confine, a set-capabilities core component used internally by Canonical snapd to construct the secure execution environment for snap applications. This vulnerability uniquely affects versions of snap-confine configured with set-capabilities (rather than standard set-uid-root installations). Due to a flaw in how privilege boundaries or security sandboxes are initialized when the binary runs under limited ambient capabilities, a local, unprivileged attacker can exploit this behavior to bypass intended restrictions and execute arbitrary code. Successful exploitation allows the local user to elevate their privileges to full root authority

References

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Our coverage of CVE-2026-8933

CVE-2026-8933high

CVE-2026-8933: Ubuntu security flaw breaks Snap sandbox protections

Qualys researchers have identified a high-severity local privilege escalation vulnerability, tracked as CVE-2026-8933 (CVSS score 7.8), affecting default installations of Ubuntu Desktop versions 24.04, 25.10, and 26.04. The flaw allows an unprivileged local attacker to gain root privileges and take full control of an affected system.