{"id":"CVE-2026-5950","aliases":["ALPINE-CVE-2026-5950","AZL-87102","BELL-CVE-2026-5950","CLSA-2026-1780406442","DEBIAN-CVE-2026-5950","EUVD-2026-31109","GHSA-2pjm-rchf-gxmp","MGASA-2026-0163","RHSA-2026:20334","SUSE-SU-2026:22198-1","SUSE-SU-2026:2673-1","SUSE-SU-2026:2676-1","UBUNTU-CVE-2026-5950","openSUSE-SU-2026:10874-1","openSUSE-SU-2026:21123-1"],"status":"published","title":"Unbounded resend loop in BIND 9 resolver","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0066,"percentile":0.51841,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-606"],"published":"2026-05-20T00:00:00Z","modified":"2026-10-26T09:43:44Z","exploits":[{"source":"pocgithub","id":"billybaraja/cve-2026-5950-bind9-resolver-dos","title":"billybaraja/cve-2026-5950-bind9-resolver-dos","date":"2026-06-14","url":"https://github.com/billybaraja/cve-2026-5950-bind9-resolver-dos"}],"fixes":[{"ecosystem":"Alpine:v3.20","package":"bind","fixed_in":["9.18.49-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"bind","fixed_in":["9.18.49-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"bind","fixed_in":["9.20.23-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"bind","fixed_in":["9.20.23-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"bind","fixed_in":["9.20.23-r0"],"sources":["osv"]},{"ecosystem":"Azure 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Advisory","advisory","report"]},{"url":"https://downloads.isc.org/isc/bind9/9.18.49","tags":["patch","Patch","fix"]},{"url":"https://downloads.isc.org/isc/bind9/9.20.23","tags":["patch","Patch","fix"]},{"url":"https://downloads.isc.org/isc/bind9/9.21.22","tags":["patch","Patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5950","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-2pjm-rchf-gxmp"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-5950","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-5950","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1780406442.html","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3592","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-5950","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0163.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35557","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/05/20/11","tags":["web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20334","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3039","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-5946","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-5950","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3592","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_20334.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479767","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3039","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3039","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479768","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3592","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479771","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-5946","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5946","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479773","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-5950","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622198-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1265591","tags":["report"]},{"url":"https://bugzilla.suse.com/1265592","tags":["report"]},{"url":"https://bugzilla.suse.com/1265593","tags":["report"]},{"url":"https://bugzilla.suse.com/1265594","tags":["report"]},{"url":"https://bugzilla.suse.com/1265595","tags":["report"]},{"url":"https://bugzilla.suse.com/1265596","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3039","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3592","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3593","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-5946","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-5947","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-5950","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262673-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1263494","tags":["report"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262676-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-5950","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8293-1","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-5950","title":"Unbounded resend loop in BIND 9 resolver","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:10:19.989Z","modified":"2026-05-20T13:38:53.211Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-606"],"updated_at":"2026-11-02T13:39:39.001586Z"}],"euvd":[{"id":"EUVD-2026-31109","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:10:19Z","modified":"2026-05-20T13:38:53Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T18:21:14.831553Z"}],"ghsa":[{"id":"GHSA-2pjm-rchf-gxmp","title":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad...","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T15:35:33Z","modified":"2026-05-20T15:35:34Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-606"],"updated_at":"2026-11-02T15:08:13.87243Z"}],"nvd":[{"id":"CVE-2026-5950","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:16:40.45Z","modified":"2026-07-23T12:10:00.11Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-606"],"updated_at":"2026-11-02T14:12:19.752984Z"}],"osv":[{"id":"ALPINE-CVE-2026-5950","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:16:40.45Z","modified":"2026-10-01T02:17:49.367520502Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:27:50.764331Z"},{"id":"BELL-CVE-2026-5950","status":"published","published":"2026-05-21T06:10:54.922628Z","modified":"2026-05-28T07:15:27.504651118Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:28:24.657778Z"},{"id":"CVE-2026-5950","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:16:40.45Z","modified":"2026-10-24T10:30:54.318474702Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:12.496548Z"},{"id":"DEBIAN-CVE-2026-5950","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:16:40.45Z","modified":"2026-10-01T03:03:28.327172821Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:57.932517Z"},{"id":"RHSA-2026:20334","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-05-22T10:07:03Z","modified":"2026-10-12T10:04:44Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:18.983284Z"},{"id":"UBUNTU-CVE-2026-5950","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T00:00:00Z","modified":"2026-07-31T01:59:55.319799223Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T16:56:41.911783Z"},{"id":"AZL-87102","title":"CVE-2026-5950 affecting package bind for versions less than 9.20.23-1","description":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","status":"published","published":"2026-05-20T13:16:40Z","modified":"2026-08-28T17:56:42.010738Z","updated_at":"2026-11-02T15:28:10.677811Z"},{"id":"CLSA-2026-1780406442","title":"bind: Fix of 2 CVEs","description":"- CVE-2026-5950: fix unbounded resend loop in resolver bad-server handling\n- CVE-2026-3592: limit addresses returned per ADB find and dedup resolver\n  SLIST to mitigate resource-exhaustion amplification","status":"published","published":"2026-06-02T13:21:28Z","modified":"2026-10-26T09:43:44.335247361Z","updated_at":"2026-11-02T15:43:45.445699Z"},{"id":"MGASA-2026-0163","title":"Updated bind packages fix security vulnerabilities","description":"Updated bind package fixes security vulnerabilities:\n* BIND 9 server memory exhaustion during GSS-API TKEY negotiation\n(CVE-2026-3039)\n* Amplification vulnerabilities via self-pointed glue records\n(CVE-2026-3592)\n* Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS\nimplementation (CVE-2026-3593)\n* Invalid handling of CLASS != IN (CVE-2026-5946)\n* SIG(0) validation during query flood may lead to undefined behavior\n(CVE-2026-5947)\n*Unbounded resend loop in BIND 9 resolver (CVE-2026-5950)\n","status":"published","published":"2026-05-29T05:12:50Z","modified":"2026-05-29T05:15:04.557137681Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2026:10874-1","title":"bind-9.20.23-1.1 on GA media","description":"These are all security issues fixed in the bind-9.20.23-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-28T00:00:00Z","modified":"2026-05-29T08:15:05.063079852Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"openSUSE-SU-2026:21123-1","title":"Security update for bind","description":"This update for bind fixes the following issues\n\nUpgrade to release 9.20.23:\n\n- CVE-2026-3039: BIND 9 server memory exhaustion during GSS-API TKEY negotiation (bsc#1265591).\n- CVE-2026-3592: Amplification vulnerabilities via self-pointed glue records (bsc#1265592).\n- CVE-2026-3593: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation (bsc#1265593).\n- CVE-2026-5946: Invalid handling of CLASS != IN (bsc#1265594).\n- CVE-2026-5947: SIG(0) validation during query flood may lead to undefined behavior (bsc#1265595).\n- CVE-2026-5950: Unbounded resend loop in BIND 9 resolver (bsc#1265596).\n","status":"published","published":"2026-06-20T06:54:39Z","modified":"2026-06-30T18:24:43.759740118Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:22198-1","title":"Security update for bind","description":"This update for bind fixes the following issues\n\nUpgrade to release 9.20.23:\n\n- CVE-2026-3039: BIND 9 server memory exhaustion during GSS-API TKEY negotiation (bsc#1265591).\n- CVE-2026-3592: Amplification vulnerabilities via self-pointed glue records (bsc#1265592).\n- CVE-2026-3593: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation (bsc#1265593).\n- CVE-2026-5946: Invalid handling of CLASS != IN (bsc#1265594).\n- CVE-2026-5947: SIG(0) validation during query flood may lead to undefined behavior (bsc#1265595).\n- CVE-2026-5950: Unbounded resend loop in BIND 9 resolver (bsc#1265596).\n","status":"published","published":"2026-06-20T06:53:51Z","modified":"2026-06-24T09:00:08.091993442Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:2673-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues:\n\n- CVE-2026-3039: BIND 9 server memory exhaustion during GSS-API TKEY negotiation (bsc#1265591).\n- CVE-2026-3592: Amplification vulnerabilities via self-pointed glue records (bsc#1265592).\n- CVE-2026-3593: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation (bsc#1265593).\n- CVE-2026-5946: Invalid handling of CLASS != IN (bsc#1265594).\n- CVE-2026-5947: SIG(0) validation during query flood may lead to undefined behavior (bsc#1265595).\n- CVE-2026-5950: Unbounded resend loop in BIND 9 resolver (bsc#1265596).\n\nNon security issue:\n\n- bind test failed with version 9.20.21 (bsc#1263494).\n- Upgrade to release 9.20.23\n","status":"published","published":"2026-07-02T15:04:39Z","modified":"2026-07-03T11:14:25.362998193Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:2676-1","title":"Security update for bind","description":"This update for bind fixes the following issues\n\n- CVE-2026-3039: BIND 9 server memory exhaustion during GSS-API TKEY negotiation (bsc#1265591).\n- CVE-2026-3592: Amplification vulnerabilities via self-pointed glue records (bsc#1265592).\n- CVE-2026-5946: Invalid handling of CLASS != IN (bsc#1265594).\n- CVE-2026-5950: Unbounded resend loop in BIND 9 resolver (bsc#1265596).\n- CVE-2026-3593: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation (bsc#1265593).\n\nChanges for bind:\n\n- Update to release 9.18.49\n","status":"published","published":"2026-06-29T09:53:56Z","modified":"2026-06-30T09:15:05.019082639Z","updated_at":"2026-11-02T15:54:04.519245Z"}]}}