# CVE-2026-15226: golang-github-snapcore-snapd-dev: A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compil... CVE-2026-15226 is fixed in 9 products on 1 platform, first by golang-github-snapcore-snapd-dev 2.76+ubuntu26.04.3, released July 21, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-15226 - Priority: High - CVSS: 8.4 (High) - EPSS: 0.0018 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 21, 2026 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | golang-github-snapcore-snapd-dev Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [golang-github-snapcore-snapd-dev 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-snapcore-snapd-dev-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | golang-github-snapcore-snapd-dev Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [golang-github-snapcore-snapd-dev 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-snapcore-snapd-dev-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | golang-github-snapcore-snapd-dev Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [golang-github-snapcore-snapd-dev 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-github-snapcore-snapd-dev-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | golang-github-snapcore-snapd-dev Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [golang-github-snapcore-snapd-dev 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-github-snapcore-snapd-dev-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | golang-github-snapcore-snapd-dev Ubuntu 26.04.1 LTS (resolute) | 2.76+ubuntu26.04.3 | [golang-github-snapcore-snapd-dev 2.76+ubuntu26.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-golang-github-snapcore-snapd-dev-2.76-ubuntu26.04.3.md) | Jul 21, 2026 | | Linux | golang-github-ubuntu-core-snappy-dev Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [golang-github-ubuntu-core-snappy-dev 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-github-ubuntu-core-snappy-dev-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | golang-github-ubuntu-core-snappy-dev Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [golang-github-ubuntu-core-snappy-dev 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-github-ubuntu-core-snappy-dev-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | golang-github-ubuntu-core-snappy-dev Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [golang-github-ubuntu-core-snappy-dev 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-github-ubuntu-core-snappy-dev-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | golang-github-ubuntu-core-snappy-dev Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [golang-github-ubuntu-core-snappy-dev 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-github-ubuntu-core-snappy-dev-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | snap-confine Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [snap-confine 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-snap-confine-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | snap-confine Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [snap-confine 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-snap-confine-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | snap-confine Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [snap-confine 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-snap-confine-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | snap-confine Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [snap-confine 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-snap-confine-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | snapd Debian 14 | 2.76.3-1 | [DEBIAN-CVE-2026-15226](https://patchblox.com/security/data/fix/linux/debian-cve-2026-15226.md) | Jul 21, 2026 | | Linux | snapd Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [snapd 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-snapd-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | snapd Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [snapd 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-snapd-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | snapd Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [snapd 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-snapd-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | snapd Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [snapd 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-snapd-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | snapd Ubuntu 26.04.1 LTS (resolute) | 2.76+ubuntu26.04.3 | [snapd 2.76+ubuntu26.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-snapd-2.76-ubuntu26.04.3.md) | Jul 21, 2026 | | Linux | snapd-xdg-open Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [snapd-xdg-open 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-snapd-xdg-open-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | snapd-xdg-open Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [snapd-xdg-open 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-snapd-xdg-open-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | snapd-xdg-open Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [snapd-xdg-open 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-snapd-xdg-open-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | snapd-xdg-open Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [snapd-xdg-open 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-snapd-xdg-open-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-core-launcher Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [ubuntu-core-launcher 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-core-launcher-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | ubuntu-core-launcher Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [ubuntu-core-launcher 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-core-launcher-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | ubuntu-core-launcher Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [ubuntu-core-launcher 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-core-launcher-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-core-launcher Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [ubuntu-core-launcher 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-core-launcher-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-core-snapd-units Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [ubuntu-core-snapd-units 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-core-snapd-units-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | ubuntu-core-snapd-units Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [ubuntu-core-snapd-units 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-core-snapd-units-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | ubuntu-core-snapd-units Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [ubuntu-core-snapd-units 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-core-snapd-units-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-core-snapd-units Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [ubuntu-core-snapd-units 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-core-snapd-units-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-snappy Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [ubuntu-snappy 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-snappy-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | ubuntu-snappy Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [ubuntu-snappy 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-snappy-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | ubuntu-snappy Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [ubuntu-snappy 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-snappy-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-snappy Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [ubuntu-snappy 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-snappy-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-snappy-cli Ubuntu 18.04.6 LTS (bionic) | 2.61.4ubuntu0.18.04.1+esm4 | [ubuntu-snappy-cli 2.61.4ubuntu0.18.04.1+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ubuntu-snappy-cli-2.61.4ubuntu0.18.04.1-esm4.md) | Jul 23, 2026 | | Linux | ubuntu-snappy-cli Ubuntu 20.04 LTS (focal) | 2.67.1+20.04ubuntu1~esm3 | [ubuntu-snappy-cli 2.67.1+20.04ubuntu1~esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ubuntu-snappy-cli-2.67.1-20.04ubuntu1-esm3.md) | Jul 23, 2026 | | Linux | ubuntu-snappy-cli Ubuntu 22.04.1 LTS (jammy) | 2.76+ubuntu22.04.1 | [ubuntu-snappy-cli 2.76+ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ubuntu-snappy-cli-2.76-ubuntu22.04.1.md) | Jul 23, 2026 | | Linux | ubuntu-snappy-cli Ubuntu 24.04.5 LTS (noble) | 2.76+ubuntu24.04.1 | [ubuntu-snappy-cli 2.76+ubuntu24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ubuntu-snappy-cli-2.76-ubuntu24.04.1.md) | Jul 23, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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