{"id":"DEBIAN-CVE-2026-58216","details":"An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) password change (kpasswd) service. When processing malformed ASN.1-encoded Kerberos password change request, Samba server miscalculates the structure size and attempts to read up to six bytes beyond the end of the allocated buffer. While this out-of-bounds read typically results in a harmless decryption failure, if the read hits unmapped memory, it causes the KDC process to crash. An authenticated attacker can send a specially crafted kpasswd request containing malformed ASN.1 data to trigger the out-of-bounds read, which may cause the KDC process to terminate, resulting in a denial of service.","modified":"2026-09-14T17:03:44.204123388Z","published":"2026-07-30T16:17:14.767Z","upstream":["CVE-2026-58216"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-58216"}],"affected":[{"package":{"name":"samba","ecosystem":"Debian:12","purl":"pkg:deb/debian/samba?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:4.17.10+dfsg-0+deb12u1","2:4.17.10+dfsg-0+deb12u1~bpo11+1","2:4.17.11+dfsg-0+deb12u1","2:4.17.12+dfsg-0+deb12u1","2:4.17.12+dfsg-0+deb12u1~bpo11+1","2:4.17.12+dfsg-0+deb12u2","2:4.17.12+dfsg-0+deb12u3","2:4.17.12+dfsg-0+deb12u4","2:4.17.8+dfsg-2","2:4.17.8+dfsg-2.1","2:4.17.9+dfsg-0+deb12u1","2:4.17.9+dfsg-0+deb12u2","2:4.17.9+dfsg-0+deb12u3","2:4.17.9+dfsg-0+deb12u3~bpo11+1","2:4.18.0+dfsg-1~exp1","2:4.18.0~rc1+dfsg-1exp","2:4.18.0~rc2+dfsg-1","2:4.18.0~rc3+dfsg-1","2:4.18.0~rc4+dfsg-1","2:4.18.1+dfsg-1~exp1","2:4.18.2+dfsg-1","2:4.18.3+dfsg-1","2:4.18.3+dfsg-2","2:4.18.3+dfsg-3","2:4.18.4+dfsg-1","2:4.18.4+dfsg-2","2:4.18.4+dfsg-2~bpo12+1","2:4.18.5+dfsg-1","2:4.18.5+dfsg-2","2:4.18.5+dfsg-2~bpo12+1","2:4.18.6+dfsg-1","2:4.18.6+dfsg-1~bpo12+1","2:4.18.8+dfsg-1~bpo12+1","2:4.19.0+dfsg-1","2:4.19.0~rc1+dfsg-1","2:4.19.0~rc1+dfsg-2","2:4.19.0~rc1+dfsg-3","2:4.19.0~rc2+dfsg-1","2:4.19.0~rc4+dfsg-1","2:4.19.0~rc4+dfsg-2","2:4.19.1+dfsg-1","2:4.19.1+dfsg-2","2:4.19.1+dfsg-3","2:4.19.1+dfsg-4","2:4.19.2+dfsg-1","2:4.19.3+dfsg-1","2:4.19.3+dfsg-1~bpo12+1","2:4.19.3+dfsg-2","2:4.19.4+dfsg-1","2:4.19.4+dfsg-2","2:4.19.4+dfsg-2~bpo12+1","2:4.19.4+dfsg-3","2:4.19.4+dfsg-3~bpo12+1","2:4.19.5+dfsg-1","2:4.19.5+dfsg-2","2:4.19.5+dfsg-3","2:4.19.5+dfsg-4","2:4.19.5+dfsg-4~bpo12+1","2:4.19.5+dfsg-5","2:4.19.6+dfsg-1","2:4.19.6+dfsg-2","2:4.19.6+dfsg-3","2:4.19.6+dfsg-3~bpo12+1","2:4.20.0+dfsg-1~exp1","2:4.20.0+dfsg-1~exp2","2:4.20.0~rc1+dfsg-1","2:4.20.0~rc2+dfsg-1","2:4.20.0~rc2+dfsg-2","2:4.20.0~rc2+dfsg-3","2:4.20.1+dfsg-1","2:4.20.1+dfsg-2","2:4.20.1+dfsg-3","2:4.20.1+dfsg-4","2:4.20.1+dfsg-4~bpo12+1","2:4.20.1+dfsg-5","2:4.20.2+dfsg-1","2:4.20.2+dfsg-10","2:4.20.2+dfsg-2","2:4.20.2+dfsg-2~bpo12+1","2:4.20.2+dfsg-2~bpo12+2","2:4.20.2+dfsg-3","2:4.20.2+dfsg-4","2:4.20.2+dfsg-5","2:4.20.2+dfsg-5~bpo12+1","2:4.20.2+dfsg-6","2:4.20.2+dfsg-6~bpo12+1","2:4.20.2+dfsg-7","2:4.20.2+dfsg-8","2:4.20.2+dfsg-9","2:4.20.2+dfsg-9~exp1","2:4.20.2+dfsg-9~exp2","2:4.20.4+dfsg-1~bpo12+1","2:4.20.5+dfsg-1~bpo12+1","2:4.21.0+dfsg-1","2:4.21.0~rc1+dfsg-1","2:4.21.0~rc1+really4.20.2+dfsg-11","2:4.21.0~rc1+really4.20.2+dfsg-11r","2:4.21.0~rc1+really4.20.3+dfsg-1","2:4.21.0~rc1+really4.20.4+dfsg-1","2:4.21.0~rc2+dfsg-1","2:4.21.1+dfsg-1","2:4.21.1+dfsg-1~bpo12+1","2:4.21.1+dfsg-2","2:4.21.1+dfsg-2+hurd.1","2:4.21.1+dfsg-2~bpo12+1","2:4.21.2+dfsg-1","2:4.21.2+dfsg-2","2:4.21.2+dfsg-3","2:4.21.2+dfsg-3~bpo12+1","2:4.21.2+dfsg-4","2:4.21.2+dfsg-4+hurd.1","2:4.21.2+dfsg-4~exp1","2:4.21.3+dfsg-1","2:4.21.3+dfsg-1~bpo12+1","2:4.21.3+dfsg-2","2:4.21.3+dfsg-3","2:4.21.3+dfsg-4","2:4.21.3+dfsg-4~bpo12+1","2:4.21.3+dfsg-5","2:4.21.3+dfsg-5~bpo12+1","2:4.21.3+dfsg-6","2:4.21.3+dfsg-6~bpo12+1","2:4.21.4+dfsg-1","2:4.21.4+dfsg-1~bpo12+1","2:4.21.5+dfsg-1~bpo12+1","2:4.22.0+dfsg-1","2:4.22.0+dfsg-2","2:4.22.0+dfsg-3","2:4.22.0~rc1+dfsg-1","2:4.22.1+dfsg-1","2:4.22.1+dfsg-1~bpo12+1","2:4.22.2+dfsg-1","2:4.22.2+dfsg-1~bpo12+1","2:4.22.3+dfsg-1","2:4.22.3+dfsg-2","2:4.22.3+dfsg-2~bpo12+1","2:4.22.3+dfsg-3","2:4.22.3+dfsg-4","2:4.22.3+dfsg-4~bpo12+1","2:4.22.4+dfsg-1","2:4.22.4+dfsg-1~deb13u1","2:4.22.4+dfsg-1~deb13u1~bpo12+1","2:4.23.0+dfsg-1","2:4.23.0+dfsg-2","2:4.23.0+dfsg-3","2:4.23.0~rc1+dfsg-1","2:4.23.0~rc2+dfsg-1","2:4.23.0~rc3+dfsg-1","2:4.23.1+dfsg-1","2:4.23.2+dfsg-1","2:4.23.3+dfsg-1","2:4.23.3+dfsg-1~bpo13+1","2:4.23.4+dfsg-1","2:4.23.4+dfsg-1~bpo13+1","2:4.23.5+dfsg-1","2:4.23.5+dfsg-1~bpo13+1","2:4.23.6+dfsg-1","2:4.23.6+dfsg-2","2:4.23.6+dfsg-2~bpo13+1","2:4.24.0+dfsg-1","2:4.24.0~rc1+dfsg-1","2:4.24.0~rc1+dfsg-2","2:4.24.0~rc1+dfsg-3","2:4.24.0~rc2+dfsg-1","2:4.24.1+dfsg-1","2:4.24.2+dfsg-1","2:4.24.2+dfsg-1~bpo13+1","2:4.24.3+dfsg-1","2:4.24.3+dfsg-1~bpo13+1","2:4.24.4+dfsg-1","2:4.24.4+dfsg-1~bpo13+1","2:4.24.5+dfsg-1","2:4.24.5+dfsg-1~bpo13+1","2:4.24.6+dfsg-1","2:4.24.7+dfsg-1","2:4.24.7+dfsg-1~bpo13+1","2:4.25.0~rc1+dfsg-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58216.json"}},{"package":{"name":"samba","ecosystem":"Debian:13","purl":"pkg:deb/debian/samba?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.22.10+dfsg-0+deb13u2"}]}],"versions":["2:4.22.10+dfsg-0+deb13u1","2:4.22.3+dfsg-4","2:4.22.4+dfsg-1","2:4.22.4+dfsg-1~deb13u1","2:4.22.4+dfsg-1~deb13u1~bpo12+1","2:4.22.6+dfsg-0+deb13u1","2:4.22.6+dfsg-0+deb13u1~bpo12+1","2:4.22.8+dfsg-0+deb13u1","2:4.22.8+dfsg-0+deb13u2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58216.json"}},{"package":{"name":"samba","ecosystem":"Debian:14","purl":"pkg:deb/debian/samba?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.24.5+dfsg-1"}]}],"versions":["2:4.22.3+dfsg-4","2:4.22.4+dfsg-1","2:4.22.4+dfsg-1~deb13u1","2:4.22.4+dfsg-1~deb13u1~bpo12+1","2:4.23.0+dfsg-1","2:4.23.0+dfsg-2","2:4.23.0+dfsg-3","2:4.23.0~rc1+dfsg-1","2:4.23.0~rc2+dfsg-1","2:4.23.0~rc3+dfsg-1","2:4.23.1+dfsg-1","2:4.23.2+dfsg-1","2:4.23.3+dfsg-1","2:4.23.3+dfsg-1~bpo13+1","2:4.23.4+dfsg-1","2:4.23.4+dfsg-1~bpo13+1","2:4.23.5+dfsg-1","2:4.23.5+dfsg-1~bpo13+1","2:4.23.6+dfsg-1","2:4.23.6+dfsg-2","2:4.23.6+dfsg-2~bpo13+1","2:4.24.0+dfsg-1","2:4.24.0~rc1+dfsg-1","2:4.24.0~rc1+dfsg-2","2:4.24.0~rc1+dfsg-3","2:4.24.0~rc2+dfsg-1","2:4.24.1+dfsg-1","2:4.24.2+dfsg-1","2:4.24.2+dfsg-1~bpo13+1","2:4.24.3+dfsg-1","2:4.24.3+dfsg-1~bpo13+1","2:4.24.4+dfsg-1","2:4.24.4+dfsg-1~bpo13+1","2:4.24.5+dfsg-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58216.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}