{
  "cveId": "CVE-2026-3591",
  "url": "https://patchblox.com/security/cve/CVE-2026-3591",
  "summary": "CVE-2026-3591 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-3591, released March 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass",
  "description": "A use-after-return vulnerability exists in the \u0060named\u0060 server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.",
  "published": "2026-03-24T17:00:00Z",
  "severity": "Moderate",
  "cvss": 5.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
  "cwe": "Return of Stack Variable Address",
  "epss": 0.00367,
  "epssPercentile": 0.30715,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3591",
  "fixes": [
    {
      "platform": "linux",
      "product": "bind",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "9.20.21-160000.1.1",
      "fix": "OPENSUSE-SU-2026:20550-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20550-1",
      "released": "2026-04-16T10:12:49Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "sles 15.7",
      "fixedVersion": "9.20.21-150700.3.18.1",
      "fix": "SUSE-SU-2026:1351-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-1351-1",
      "released": "2026-04-15T13:36:44Z"
    },
    {
      "platform": "linux",
      "product": "bind",
      "release": "sles 16.0",
      "fixedVersion": "9.20.21-160000.1.1",
      "fix": "SUSE-SU-2026:21204-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-21204-1",
      "released": "2026-04-16T10:19:52Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:9.20.21-1~deb13u1",
      "fix": "DEBIAN-CVE-2026-3591",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-3591",
      "released": "2026-03-25T14:16:37Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Debian 14",
      "fixedVersion": "1:9.20.21-1",
      "fix": "DEBIAN-CVE-2026-3591",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-3591",
      "released": "2026-03-25T14:16:37Z"
    },
    {
      "platform": "linux",
      "product": "bind9",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.2",
      "fix": "bind9 1:9.20.11-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-1-9.20.11-1ubuntu2.2",
      "released": "2026-04-15T18:59:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-dnsutils",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.2",
      "fix": "bind9-dnsutils 1:9.20.11-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-dnsutils-1-9.20.11-1ubuntu2.2",
      "released": "2026-04-15T18:59:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-host",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.2",
      "fix": "bind9-host 1:9.20.11-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-host-1-9.20.11-1ubuntu2.2",
      "released": "2026-04-15T18:59:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-libs",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.2",
      "fix": "bind9-libs 1:9.20.11-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-libs-1-9.20.11-1ubuntu2.2",
      "released": "2026-04-15T18:59:31Z"
    },
    {
      "platform": "linux",
      "product": "bind9-utils",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1:9.20.11-1ubuntu2.2",
      "fix": "bind9-utils 1:9.20.11-1ubuntu2.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-bind9-utils-1-9.20.11-1ubuntu2.2",
      "released": "2026-04-15T18:59:31Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}