{"id":"DEBIAN-CVE-2026-58218","details":"A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service.","modified":"2026-09-14T17:03:46.261829271Z","published":"2026-07-30T14:17:00.307Z","upstream":["CVE-2026-58218"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-58218"}],"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 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