8.4
HIGH CVSS 3.1
CVE-2026-15226
snapd snap-confine Sandbox Confinement Bypass via Omission of setuid Restriction in Seccomp Templates
Description

A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes. Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes.

INFO

Published Date :

July 21, 2026, 3:16 p.m.

Last Modified :

July 21, 2026, 3:16 p.m.

Remotely Exploit :

No
Affected Products

The following products are affected by CVE-2026-15226 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

No affected product recoded yet

CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH cc1ad9ee-3454-478d-9317-d3e869d708bc
CVSS 3.1 HIGH [email protected]
Solution
Update snapd to the latest version to address seccomp template misconfigurations affecting snap confinement.
  • Update snapd to the latest version.
  • Ensure seccomp templates block setuid executables.
  • Verify sandbox confinement policies.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-15226.

URL Resource
https://ubuntu.com/security/CVE-2026-15226
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-15226 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-15226 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-15226 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2026-15226 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by [email protected]

    Jul. 21, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://github.com/canonical/snapd/', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.76.1', 'versionType': 'semver'}], 'packageName': 'snapd', 'collectionURL': 'https://github.com/canonical', 'defaultStatus': 'unaffected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 26.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu26.04.3', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/resolute', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 24.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu24.04.1', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/noble', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 22.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu22.04.1', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/jammy', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 20.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.67.1+20.04ubuntu1~esm2', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/focal', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 18.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.61.4ubuntu0.18.04.1+esm3', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/bionic', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 16.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.61.4ubuntu0.16.04.1+esm3'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/xenial', 'defaultStatus': 'affected'}]
    Added Description A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process operations capable of creating or manipulating file execution flags with set-user-ID attributes. Consequently, an application running within a strictly confined snap environment can successfully compile or drop binaries and apply setuid properties to them. If a compromised or malicious process inside the snap sandbox executes these generated setuid binaries, it can potentially circumvent architectural sandboxing assumptions, drop intended restriction policies, or execute privileged actions inside the container namespace that should otherwise be strictly blocked. The vulnerability has been resolved by hardening the seccomp template engine to block the execution and creation of setuid executables by sandboxed snap processes.
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
    Added CWE CWE-250
    Added Reference https://ubuntu.com/security/CVE-2026-15226
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.