{"id":"CVE-2023-26437","aliases":["DEBIAN-CVE-2023-26437","EUVD-2023-30257","GHSA-4wg5-gmxh-4r2r","UBUNTU-CVE-2023-26437","openSUSE-SU-2023:0101-1","openSUSE-SU-2024:0048-1","openSUSE-SU-2024:12838-1"],"status":"published","title":"Deterred spoofing attempts can lead to authoritative servers being marked unavailable","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","severity":{"version":"3.1","score":3.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00593,"percentile":0.48618,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2023-04-04T14:37:29Z","modified":"2026-10-28T02:30:52Z","fixes":[{"ecosystem":"Debian:12","package":"pdns-recursor","fixed_in":["4.8.4-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"pdns-recursor","fixed_in":["4.8.4-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"pdns-recursor","fixed_in":["4.8.4-1"],"sources":["osv"]},{"ecosystem":"SUSE:Package Hub 15 SP4","package":"pdns-recursor","fixed_in":["4.6.6-bp154.2.6.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 15.4","package":"pdns-recursor","fixed_in":["4.6.6-bp154.2.6.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"pdns-recursor","fixed_in":["4.8.4-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.4-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.4-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.4-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.7.3-1","4.0.0~alpha1-1","4.0.0~alpha1-2","4.0.0~alpha2-2","4.0.0~alpha2-2ubuntu0.1","4.0.0~alpha2-2ubuntu0.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.6-1","4.0.6-1build1","4.0.7-1","4.1.1-1","4.1.1-1build1","4.1.1-2","4.1.1-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.0-6","4.2.1-1","4.2.1-1build1","4.2.1-1build2","4.2.1-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.2-3","4.6.0-1ubuntu1","4.6.0-1ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.0-2","4.9.1-4","4.9.2-1","4.9.2-1build1","4.9.2-2","4.9.3-1","4.9.3-1build2","4.9.3-1build3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.0-5","5.2.2-1","5.2.2-2","5.2.4-2","5.2.4-2build2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.5-1","5.4.3-1","5.4.5-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2.4-2build2","5.3.1-1","5.3.3-1","5.3.4-1","5.3.4-1build1","5.3.4-2","5.3.5-1"]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP4","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.6-bp154.2.6.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 15.4","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.6.6-bp154.2.6.1"}]}]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP5","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.6-bp155.2.3.1"}]}],"bundled":3},{"source":"osv","ecosystem":"openSUSE:Leap 15.5","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.6-bp155.2.3.1"}]}],"bundled":3},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"pdns-recursor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.8.4-1.1"}]}]}],"products":[{"vendor":"powerdns","product":"recursor"}],"references":[{"url":"https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2023-02.html","tags":["x_transferred","Vendor Advisory","advisory","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CN7VMRYKZHG2UDUAK326LXD3JY7NO3LR/","tags":["x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IHPD6SIQOG7245GXFQHPUEI4AZ6Y3KD6/","tags":["x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-26437","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CN7VMRYKZHG2UDUAK326LXD3JY7NO3LR"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IHPD6SIQOG7245GXFQHPUEI4AZ6Y3KD6"},{"url":"https://github.com/advisories/GHSA-4wg5-gmxh-4r2r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26437.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-26437","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-26437","tags":["report"]},{"url":"https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2023-02.html","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-26437","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/O77AR5R2DS34JA2Y3VBBU6V4IZWVEM56/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1209897","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2023-26437","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/KZPNQJJ7XX3KPQTYPFVQXAGEDZZNY73R/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1219823","tags":["report"]},{"url":"https://bugzilla.suse.com/1219826","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2023-50387","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-50868","tags":["web"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-26437","title":"Deterred spoofing attempts can lead to authoritative servers being marked unavailable","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T14:37:29.388Z","modified":"2025-02-13T16:44:54.374Z","cvss":[{"version":"3.1","score":3.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:15.779187Z"}],"euvd":[{"id":"EUVD-2023-30257","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T14:37:29Z","modified":"2025-02-13T16:44:54Z","cvss":[{"version":"3.1","score":3.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-03T00:03:50.947767Z"}],"ghsa":[{"id":"GHSA-4wg5-gmxh-4r2r","title":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked...","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T15:30:27Z","modified":"2025-02-13T18:32:32Z","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-400"],"updated_at":"2026-11-02T14:59:55.900946Z"}],"nvd":[{"id":"CVE-2023-26437","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T15:15:08.88Z","modified":"2026-06-17T05:43:20.007Z","cvss":[{"version":"3.1","score":3.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"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":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:07:51.883939Z"}],"osv":[{"id":"CVE-2023-26437","title":"Deterred spoofing attempts can lead to authoritative servers being marked unavailable","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T14:37:29.388Z","modified":"2026-10-28T02:30:52.330418783Z","cvss":[{"version":"3.1","score":3.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:44:31.135751Z"},{"id":"DEBIAN-CVE-2023-26437","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T15:15:08.88Z","modified":"2026-10-26T18:00:45.395539857Z","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":"2026-11-02T15:45:39.369204Z"},{"id":"UBUNTU-CVE-2023-26437","description":"Denial of service vulnerability in PowerDNS Recursor allows authoritative servers to be marked unavailable.This issue affects Recursor: through 4.6.5, through 4.7.4 , through 4.8.3.","status":"published","published":"2023-04-04T15:15:00Z","modified":"2026-10-17T12:56:04.712903705Z","cvss":[{"version":"3.1","score":3.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:L","level":"low"},{"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":"2026-11-02T16:54:20.198616Z"},{"id":"openSUSE-SU-2023:0101-1","title":"Security update for pdns-recursor","description":"This update for pdns-recursor fixes the following issues:\n\npdns-recursor was updated to 4.6.6:\n\n* fixes deterred spoofing attempts can lead to authoritative\n  servers being marked unavailable (boo#1209897, CVE-2023-26437)\n\nFixes in 4.6.5:\n\n* When an expired NSEC3 entry is seen, move it to the front\n  of the expiry queue\n* Log invalid RPZ content when obtained via IXFR\n* Detect invalid bytes in makeBytesFromHex()\n* Timeout handling for IXFRs as a client\n\nFixes in 4.6.4:\n\n* Check qperq limit if throttling happened, as it increases counters\n* Failure to retrieve DNSKEYs of an Insecure zone should not be fatal\n* Resize answer length to actual received length in udpQueryResponse\n","status":"published","published":"2023-05-02T07:36:56Z","modified":"2026-02-04T02:31:11.702683Z","updated_at":"2026-11-02T16:58:32.653274Z"},{"id":"openSUSE-SU-2024:0048-1","title":"Security update for pdns-recursor","description":"This update for pdns-recursor fixes the following issues:\n\nUpdate to 4.8.6:\n\n* fixes case when crafted DNSSEC records in a zone can lead to\n  a denial of service in Recursor\n  https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html\n (boo#1219823, boo#1219826, CVE-2023-50387, CVE-2023-50868)\n\n\nChanges in 4.8.5:\n\n* (I)XFR: handle partial read of len prefix.\n* YaHTTP: Prevent integer overflow on very large chunks.\n* Fix setting of policy tags for packet cache hits.\n\nChanges in 4.8.4:\n\n* Deterred spoofing attempts can lead to authoritative servers\n  being marked unavailable (boo#1209897, CVE-2023-26437)\n","status":"published","published":"2024-02-14T13:38:11Z","modified":"2026-02-04T02:56:44.700313Z","updated_at":"2026-11-02T16:58:33.135986Z"},{"id":"openSUSE-SU-2024:12838-1","title":"pdns-recursor-4.8.4-1.1 on GA media","description":"These are all security issues fixed in the pdns-recursor-4.8.4-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:18:26.629504Z","updated_at":"2026-11-02T16:58:36.025801Z"}]}}