CVE-2026-8933 | defend.network

What is CVE-2026-8933?

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.

CVSS7.8 NVD 3.1

SeverityHIGH

ExploitationNo exploitation reported

EPSS<1% · P4

Triage statusNo Known Exploit

ActionPatch this week

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

CWECWE-250

NVD published2026-07-21

NVD last modified2026-07-22

Timeline

2026-07-21Published to the U.S. National Vulnerability Database (NVD)
2026-07-22NVD record last updated
2026-07-23First covered in a defend.network daily briefing

Affected product

See advisory

Remediation Steps

Apply security updates to snap-confine on affected Ubuntu Desktop systems (24.04, 25.10, 26.04)
Run system updates via apt-get to obtain the patched snapd and snap-confine packages
Restart the snapd service or reboot affected systems to apply the fix
Audit systems for evidence of unauthorized privilege escalation attempts

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 3 of July 2026 (July 20 – 26)
Ubuntu, WordPress, Adobe critical flaws under active exploitation; CISA KEV adds four CVEs (2026-07-23)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.