Vulnerability in snapd (UBUNTU-CVE-2026-15226)
Summary
Vulnerability in snapd (UBUNTU-CVE-2026-15226). Confidential information can be exposed externally. Mitigation: upgrade to 2.61.4ubuntu0.16.04.1+esm4 or later.
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as UBUNTU-CVE-2026-15226 has been found in snapd.
Confidential information can be exposed externally.
What to do: upgrade snapd to 2.61.4ubuntu0.16.04.1+esm4 or later.
If unsure, ask your IT team or search "snapd UBUNTU-CVE-2026-15226" on the vendor's site.
UBUNTU-CVE-2026-15226 (snapd)
Attack vector: local / no user interaction
Patched: 2.61.4ubuntu0.16.04.1+esm4 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in snapd.
Check the vendor advisory for the affected versions of snapd.
Severity: ?. Confidential information can be exposed externally.
Update to 2.61.4ubuntu0.16.04.1+esm4.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'snapd' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'snapd' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
snapdを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade snapd to 2.61.4ubuntu0.16.04.1+esm4ステージング環境で 2.61.4ubuntu0.16.04.1+esm4 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org