{"id":"USN-8914-1","summary":"google-guest-agent, google-osconfig-agent vulnerability","details":"It was discovered that the Go x/net/idna package, vendored in Google Guest\nAgent and Google OS Config Agent, incorrectly accepted Punycode-encoded\nlabels that decoded to ASCII-only labels when processing internationalized\ndomain names. A remote attacker could possibly use this issue to bypass\nhostname-based access controls and escalate privileges.","modified":"2026-10-12T20:28:08.148885684Z","published":"2026-10-12T15:24:07Z","related":["UBUNTU-CVE-2026-39821"],"upstream":["CVE-2026-39821","UBUNTU-CVE-2026-39821"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8914-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-39821"}],"affected":[{"package":{"name":"google-guest-agent","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/google-guest-agent?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20250116.00-0ubuntu1~22.04.4"}]}],"versions":["20210629.00-0ubuntu1","20210629.00-0ubuntu2","20220104.00-0ubuntu1","20220104.00-0ubuntu2","20220622.00-0ubuntu2~22.04.0","20220622.00-0ubuntu2~22.04.1","20230426.00-0ubuntu2~22.04.0","20231004.02-0ubuntu1~22.04.1","20231004.02-0ubuntu1~22.04.2","20231004.02-0ubuntu1~22.04.3","20231004.02-0ubuntu1~22.04.4","20231004.02-0ubuntu1~22.04.5","20240716.00-0ubuntu1~22.04.0","20241011.01-0ubuntu1~22.04.0","20250116.00-0ubuntu1~22.04.0","20250116.00-0ubuntu1~22.04.1","20250116.00-0ubuntu1~22.04.2","20250116.00-0ubuntu1~22.04.3"],"ecosystem_specific":{"binaries":[{"binary_version":"20250116.00-0ubuntu1~22.04.4","binary_name":"google-guest-agent"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-39821","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"type":"Ubuntu","score":"high"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8914-1.json"}},{"package":{"name":"google-osconfig-agent","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/google-osconfig-agent?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"20251028.00-0ubuntu2~22.04.1"}]}],"versions":["20210608.1-0ubuntu1","20210608.1-0ubuntu2","20210608.1-0ubuntu3","20220824.00-0ubuntu1~22.04.1","20220824.00-0ubuntu1~22.04.2","20230504.00-0ubuntu1~22.04.0","20230504.00-0ubuntu1~22.04.1","20240320.00-0ubuntu1~22.04.0","20240320.00-0ubuntu1~22.04.1","20240524.03-0ubuntu2~22.04.0","20240524.03-0ubuntu2~22.04.1","20240926.03-0ubuntu1~22.04.0","20250115.01-0ubuntu1~22.04.0","20251028.00-0ubuntu2~22.04.0"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"google-osconfig-agent","binary_version":"20251028.00-0ubuntu2~22.04.1"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},{"score":"high","type":"Ubuntu"}],"id":"CVE-2026-39821"}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8914-1.json"}}],"schema_version":"1.9.0"}