{"id":"USN-8883-2","summary":"golang-1.23 vulnerability","details":"USN-8883-1 fixed a vulnerability in Go versions 1.18, 1.21, and 1.24. This\nupdate provides the corresponding fix for Go version 1.23.\n\nOriginal advisory details:\n\n It was discovered that the Go x/net/idna package incorrectly handled\n certain Punycode-encoded labels that decoded to ASCII-only labels. An\n attacker could possibly use this issue to bypass hostname-based access\n controls and escalate privileges.","modified":"2026-10-17T12:58:09.597656891Z","published":"2026-10-15T11:40:31Z","related":["UBUNTU-CVE-2026-39821"],"upstream":["CVE-2026-39821","UBUNTU-CVE-2026-39821"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8883-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-39821"}],"affected":[{"package":{"name":"golang-1.23","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/golang-1.23?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.23.1-1~22.04.3"}]}],"versions":["1.23.1-1~22.04","1.23.1-1~22.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.23.1-1~22.04.3","binary_name":"golang-1.23"},{"binary_name":"golang-1.23-go","binary_version":"1.23.1-1~22.04.3"},{"binary_version":"1.23.1-1~22.04.3","binary_name":"golang-1.23-src"}]},"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"},{"score":"high","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8883-2.json"}}],"schema_version":"1.9.0"}