{"id":"CVE-2026-15226","aliases":["DEBIAN-CVE-2026-15226","EUVD-2026-46261","GHSA-9pj8-7m3m-mh5h","UBUNTU-CVE-2026-15226","USN-8579-1"],"status":"published","title":"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.","severity":{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00184,"percentile":0.08112,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-250"],"published":"2026-07-21T14:00:00Z","modified":"2026-10-28T02:30:43Z","fixes":[{"ecosystem":"Debian:14","package":"snapd","fixed_in":["2.76.3-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"snapd","fixed_in":["2.61.4ubuntu0.16.04.1+esm4"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"snapd","fixed_in":["2.61.4ubuntu0.18.04.1+esm4"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"snapd","fixed_in":["2.67.1+20.04ubuntu1~esm3"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"snapd","fixed_in":["2.76+ubuntu22.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"snapd","fixed_in":["2.76+ubuntu24.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.04:LTS","package":"snapd","fixed_in":["2.76+ubuntu26.04.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.57.6-1","2.57.6-1+deb12u1","2.59.5-1","2.60.2-1","2.61.1-1","2.61.2-1","2.61.2-2","2.62-1","2.62-2","2.62-3","2.62-4","2.62-5","2.63-1","2.63-2","2.63-3","2.63-4","2.65.1-1","2.65.3-1","2.66.1-1","2.66.1-2","2.67-1","2.68.3-2","2.68.3-3","2.71-1","2.71-2","2.71-3","2.72-1","2.73-3","2.73-4","2.74.1-1","2.75.2-1","2.75.2-2","2.76-1","2.76.3-1","2.76.3-2","2.77.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.68.3-3","2.68.3-3+deb13u1","2.71-1","2.71-2","2.71-3","2.72-1","2.73-3","2.73-4","2.74.1-1","2.75.2-1","2.75.2-2","2.76-1","2.76.3-1","2.76.3-2","2.77.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.76.3-1"}]}],"versions":["2.68.3-3","2.71-1","2.71-2","2.71-3","2.72-1","2.73-3","2.73-4","2.74.1-1","2.75.2-1","2.75.2-2","2.76-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.61.4ubuntu0.16.04.1+esm4"}]}],"versions":["1.9","1.9.1.1","1.9.2","2.0","2.0.1","2.0.2","2.0.3","2.0.5","2.0.8","2.0.9","2.0.10","2.11+0.16.04","2.12+0.16.04","2.13","2.14.2~16.04","2.15.2ubuntu1","2.16ubuntu3","2.17.1ubuntu1","2.20.1ubuntu1","2.21","2.22.2","2.22.3","2.22.6","2.23.1","2.24.1","2.25","2.26.10","2.27.5","2.28.5","2.29.4.2","2.32.3.2","2.32.9","2.33.1ubuntu2","2.34.2","2.34.2ubuntu0.1","2.37.4","2.37.4ubuntu0.1","2.38","2.39.2","2.39.2ubuntu0.2","2.40","2.42.1","2.45.1","2.45.1ubuntu0.2","2.46.1","2.47.1","2.48","2.48.3","2.54.3+16.04~esm2","2.54.3+16.04.0ubuntu0.1~esm3","2.54.3+16.04.0ubuntu0.1~esm4","2.54.3+16.04.0ubuntu0.1~esm5","2.54.3+16.04.0ubuntu0.1~esm6","2.61.4ubuntu0.16.04.1+esm1","2.61.4ubuntu0.16.04.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.61.4ubuntu0.18.04.1+esm4"}]}],"versions":["2.28.5+17.10","2.29.4.1+18.04","2.29.4.2+18.04","2.31.1+18.04","2.32+18.04~pre5","2.32+18.04~pre6","2.32+18.04","2.32.3.2+18.04","2.32.5+18.04","2.32.8+18.04","2.32.9+18.04","2.33.1+18.04ubuntu2","2.34.2+18.04","2.34.2+18.04.1","2.37.1+18.04","2.37.1.1+18.04","2.37.4+18.04","2.37.4+18.04.1","2.38+18.04","2.39.2+18.04","2.40+18.04","2.42.1+18.04","2.45.1+18.04","2.45.1+18.04.2","2.46.1+18.04","2.47.1+18.04","2.48+18.04","2.48.3+18.04","2.49.2+18.04","2.51.1+18.04","2.54.2+18.04ubuntu1","2.54.3+18.04","2.54.3+18.04.2ubuntu0.1","2.54.3+18.04.2ubuntu0.2","2.55.5+18.04","2.57.5+18.04","2.57.5+18.04ubuntu0.1","2.58+18.04","2.58+18.04.1","2.61.4ubuntu0.18.04.1+esm1","2.61.4ubuntu0.18.04.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.67.1+20.04ubuntu1~esm3"}]}],"versions":["2.41+19.10.1","2.42.1+20.04","2.43.3+git1.8109f8","2.44~pre1+20.04","2.44+20.04","2.44.2+20.04","2.44.3+20.04","2.45.1+20.04","2.45.1+20.04.2","2.46.1+20.04","2.47.1+20.04","2.48+20.04","2.48.3+20.04","2.49.2+20.04","2.51.1+20.04ubuntu2","2.54.2+20.04ubuntu2","2.54.3+20.04","2.54.3+20.04.1","2.54.3+20.04.1ubuntu0.1","2.54.3+20.04.1ubuntu0.2","2.54.3+20.04.1ubuntu0.3","2.55.5+20.04","2.57.5+20.04","2.57.5+20.04ubuntu0.1","2.58+20.04","2.58+20.04.1","2.61.3+20.04","2.62+20.04","2.63+20.04","2.63+20.04ubuntu0.1","2.65.3+20.04","2.66.1+20.04","2.67.1+20.04","2.67.1+20.04ubuntu1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"snapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.76+ubuntu22.04.1"}]}],"versions":["2.53+21.10ubuntu1","2.54.2+22.04ubuntu1","2.54.2+2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lts"}],"references":[{"url":"https://ubuntu.com/security/CVE-2026-15226","tags":["vdb-entry","issue-tracking","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15226","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9pj8-7m3m-mh5h"},{"url":"https://github.com/canonical","tags":["web"]},{"url":"https://github.com/canonical/snapd/","tags":["web"]},{"url":"https://launchpad.net/ubuntu/+source/snapd","tags":["web"]},{"url":"https://launchpad.net/ubuntu/bionic","tags":["web"]},{"url":"https://launchpad.net/ubuntu/focal","tags":["web"]},{"url":"https://launchpad.net/ubuntu/jammy","tags":["web"]},{"url":"https://launchpad.net/ubuntu/noble","tags":["web"]},{"url":"https://launchpad.net/ubuntu/resolute","tags":["web"]},{"url":"https://launchpad.net/ubuntu/xenial","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15226.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-15226","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-15226","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8579-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2024-5300","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-8933","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-15226","title":"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.","status":"published","published":"2026-07-21T14:02:04.071Z","modified":"2026-07-22T18:28:11.44Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-250"],"updated_at":"2026-11-02T13:47:51.033687Z"}],"euvd":[{"id":"EUVD-2026-46261","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.","status":"published","published":"2026-07-21T14:02:04Z","modified":"2026-07-22T18:28:11Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T18:19:45.382067Z"}],"ghsa":[{"id":"GHSA-9pj8-7m3m-mh5h","title":"A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal...","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.","status":"published","published":"2026-07-21T15:30:44Z","modified":"2026-07-21T15:30:58Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-250"],"updated_at":"2026-11-02T15:09:37.555146Z"}],"nvd":[{"id":"CVE-2026-15226","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.","status":"published","published":"2026-07-21T15:16:31.03Z","modified":"2026-07-22T19:16:54.937Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-250"],"updated_at":"2026-11-02T14:12:31.024898Z"}],"osv":[{"id":"CVE-2026-15226","title":"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.","status":"published","published":"2026-07-21T14:02:04.071Z","modified":"2026-10-28T02:30:43.58984007Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-250"],"updated_at":"2026-11-02T15:44:57.682091Z"},{"id":"DEBIAN-CVE-2026-15226","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.","status":"published","published":"2026-07-21T15:16:31.03Z","modified":"2026-10-01T03:02:50.075039458Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:52.562592Z"},{"id":"UBUNTU-CVE-2026-15226","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.","status":"published","published":"2026-07-21T14:00:00Z","modified":"2026-07-21T23:00:17.599471989Z","cvss":[{"version":"3.1","score":8.4,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:56:00.592716Z"},{"id":"USN-8579-1","title":"snapd vulnerabilities","description":"James Henstridge discovered that snapd's default apparmor template did\nnot restrict access to systemd-userdbd varlink interface. A local\nattacker could possibly use this issue to obtain sensitive information.\n(CVE-2024-5300)\n\nQualys discovered that snap-confine can be tricked to create\nattacker-controlled files at certain privileged locations. A local\nattacker could possibly use this issue to bypass intended restrictions\nand escalate privileges to root. This issue only affected\nUbuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.\n(CVE-2026-8933)\n\nZygmunt Krynicki discovered that snapd's default seccomp template\ndid not restrict the creation of executables with the set-user-ID\nattribute. A local attacker could possibly use this issue to create\nand execute setuid binaries. (CVE-2026-15226)","status":"published","published":"2026-07-21T14:24:27Z","modified":"2026-07-21T23:14:34.410163517Z","updated_at":"2026-11-02T16:58:25.103481Z"}]}}