{"id":"USN-8416-1","summary":"golang-golang-x-net-dev vulnerability","details":"It was discovered that Go Networking incorrectly handled certain\nPunycode-encoded labels in the idna package. An attacker could possibly use\nthis issue to bypass hostname-based access restrictions.","modified":"2026-06-30T18:17:25.223844810Z","published":"2026-06-09T18:01:10Z","related":["UBUNTU-CVE-2026-39821"],"upstream":["UBUNTU-CVE-2026-39821"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8416-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-39821"}],"affected":[{"package":{"name":"golang-golang-x-net-dev","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/golang-golang-x-net-dev?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3"}]}],"versions":["1:0.0+git20170629.c81e7f2+dfsg-1ubuntu1","1:0.0+git20170629.c81e7f2+dfsg-1ubuntu2","1:0.0+git20170629.c81e7f2+dfsg-2","1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm1","1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3","binary_name":"golang-go.net-dev"},{"binary_name":"golang-golang-x-net-dev","binary_version":"1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","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":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8416-1.json"}},{"package":{"name":"golang-golang-x-net-dev","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/golang-golang-x-net-dev?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3"}]}],"versions":["1:0.0+git20190811.74dc4d7+dfsg-1","1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm1","1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"golang-go.net-dev","binary_version":"1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3"},{"binary_version":"1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3","binary_name":"golang-golang-x-net-dev"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","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":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8416-1.json"}}],"schema_version":"1.7.5"}