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
Source :
[email protected]
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
| 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.
- 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