{"id":"CVE-2026-29004","aliases":["BELL-CVE-2026-29004","DEBIAN-CVE-2026-29004","EUVD-2026-27043","GHSA-vx55-mmvv-p227","OESA-2026-2357","RHSA-2026:30652","SUSE-SU-2026:2053-1","SUSE-SU-2026:2054-1","SUSE-SU-2026:2069-1","SUSE-SU-2026:21943-1","SUSE-SU-2026:22020-1","SUSE-SU-2026:2204-1","UBUNTU-CVE-2026-29004","openSUSE-SU-2026:10740-1","openSUSE-SU-2026:20883-1"],"status":"published","title":"BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","severity":{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00375,"percentile":0.3183,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-122","CWE-131"],"published":"2026-05-04T18:05:18Z","modified":"2026-10-28T10:58:13Z","fixes":[{"ecosystem":"Alpaquita:23","package":"busybox","fixed_in":["1.35.0-r40"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"busybox","fixed_in":["1.37.0-r27"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"busybox","fixed_in":["1.37.0-r37"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened 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hat","product":"red hat enterprise linux 6"},{"vendor":"red hat","product":"red hat hardened images"},{"vendor":"vda-linux","product":"busybox_mirror"}],"references":[{"url":"https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/","tags":["technical-description","exploit","evidence"]},{"url":"https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a","tags":["patch","fix","article"]},{"url":"https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409","tags":["patch","fix","article"]},{"url":"https://busybox.net/","tags":["product","web","article"]},{"url":"https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers","tags":["third-party-advisory","advisory","article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-29004","tags":["vdb-entry","x_refsource_REDHAT","advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2466526","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29004.json","tags":["x_sadp-csaf-vex","web"]},{"url":"https://access.redhat.com/errata/RHSA-2026:30652","tags":["vendor-advisory","x_refsource_REDHAT","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29004","tags":["advisory"]},{"url":"https://busybox.net"},{"url":"https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow"},{"url":"https://github.com/advisories/GHSA-vx55-mmvv-p227"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-29004","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29004.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-29004","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2357","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_30652.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-29004","tags":["advisory","report"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262053-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1263989","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-29004","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262054-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262069-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202621943-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202622020-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20262204-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-29004","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-29004","title":"BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:05:18.962Z","modified":"2026-07-15T01:10:52.483Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-122","CWE-131"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-27043","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:05:18Z","modified":"2026-07-15T01:10:52Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:19:55.842782Z"}],"ghsa":[{"id":"GHSA-vx55-mmvv-p227","title":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client ...","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:30:31Z","modified":"2026-06-30T03:36:30Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"cwes":["CWE-122","CWE-131"],"updated_at":"2026-11-02T15:09:04.668745Z"}],"nvd":[{"id":"CVE-2026-29004","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:16:26.523Z","modified":"2026-10-26T19:10:00.163Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-122","CWE-131"],"updated_at":"2026-11-02T14:12:17.022502Z"}],"osv":[{"id":"BELL-CVE-2026-29004","status":"published","published":"2026-05-07T06:10:20.119085Z","modified":"2026-05-13T07:15:36.120846Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:23.315185Z"},{"id":"CVE-2026-29004","title":"BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:05:18.962Z","modified":"2026-10-28T10:58:13.840164558Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"DEBIAN-CVE-2026-29004","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:16:26.523Z","modified":"2026-10-27T09:47:32.289987361Z","cvss":[{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"OESA-2026-2357","title":"busybox security update","description":"The Swiss Army Knife of Embedded Linux\r\n\r\nSecurity Fix(es):\n\nBusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.(CVE-2026-29004)","status":"published","published":"2026-05-15T11:11:19Z","modified":"2026-08-18T01:19:58.574044691Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"RHSA-2026:30652","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-06-29T11:29:38Z","modified":"2026-10-06T10:30:50.209050772Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:19.963895Z"},{"id":"UBUNTU-CVE-2026-29004","description":"BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.","status":"published","published":"2026-05-04T18:16:00Z","modified":"2026-10-17T12:59:56.80409705Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":7.2,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:56:08.726452Z"},{"id":"openSUSE-SU-2026:10740-1","title":"busybox-1.37.0-11.1 on GA media","description":"These are all security issues fixed in the busybox-1.37.0-11.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-10T00:00:00Z","modified":"2026-05-11T08:15:21.255485Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"openSUSE-SU-2026:20883-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: a crafted DHCPv6 response can lead to a heap buffer overflow in the DHCPv6 client (bsc#1263989).\n","status":"published","published":"2026-06-02T13:49:06Z","modified":"2026-06-04T09:00:08.757995879Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:2053-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: Heap buffer overflow vulnerability in the DHCPv6 client\n  (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c (bsc#1263989).\n","status":"published","published":"2026-05-25T14:01:53Z","modified":"2026-05-26T08:15:05.337469051Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"id":"SUSE-SU-2026:2054-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: Heap buffer overflow vulnerability in the DHCPv6 client\n  (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c (bsc#1263989).\n","status":"published","published":"2026-05-25T14:02:18Z","modified":"2026-05-26T08:15:05.301479557Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"id":"SUSE-SU-2026:2069-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: a crafted DHCPv6 response can lead to a heap buffer overflow in the DHCPv6 client (bsc#1263989).\n","status":"published","published":"2026-05-26T07:30:10Z","modified":"2026-05-27T08:15:22.690417194Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"id":"SUSE-SU-2026:21943-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: a crafted DHCPv6 response can lead to a heap buffer overflow in the DHCPv6 client (bsc#1263989).\n","status":"published","published":"2026-06-01T10:46:46Z","modified":"2026-06-03T18:24:39.111762331Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:22020-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: a crafted DHCPv6 response can lead to a heap buffer overflow in the DHCPv6 client (bsc#1263989).\n","status":"published","published":"2026-06-02T13:48:13Z","modified":"2026-06-09T18:24:20.322290932Z","updated_at":"2026-11-02T15:54:02.654057Z"},{"id":"SUSE-SU-2026:2204-1","title":"Security update for busybox","description":"This update for busybox fixes the following issue\n\n- CVE-2026-29004: a crafted DHCPv6 response can lead to a heap buffer overflow in the DHCPv6 client (bsc#1263989).\n","status":"published","published":"2026-06-01T10:04:50Z","modified":"2026-06-02T08:45:07.112152131Z","updated_at":"2026-11-02T15:54:02.654057Z"}]}}