{
  "cveId": "CVE-2026-18724",
  "url": "https://patchblox.com/security/cve/CVE-2026-18724",
  "summary": "CVE-2026-18724 is fixed in 9 products on 1 platform, first by ALAS2023-2026-2120, released August 31, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "open-iscsi vulnerability",
  "description": "Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities:\nCVE-2026-18728:\n\tA flaw was found in open-iscsi. An integer underflow vulnerability in the \u0060iscsiuio\u0060 component, specifically during IPv4 Dynamic Host Configuration Protocol (DHCP) parsing, allows a remote attacker on the same local network segment to cause a denial of service. By sending a specially crafted IPv4/UDP DHCP reply, the attacker can trigger an out-of-bounds read, leading to the \u0060iscsiuio\u0060 process crashing. This issue affects systems where \u0060iscsiuio\u0060 is actively handling IPv4 DHCP traffic.\n\nCVE-2026-18727:\n\tA flaw was found in open-iscsi\u0027s iscsiuio component. This vulnerability involves an integer underflow and out-of-bounds read during Dynamic Host Configuration Protocol for IPv6 (DHCPv6) packet parsing. Specifically, crafted DHCPv6 Advertise traffic with a short User Datagram Protocol (UDP) length can cause the DHCPv6 payload length to underflow. An unauthenticated attacker on an adjacent network segment can exploit this by sending specially crafted IPv6 UDP traffic while the client is in an active DHCPv6 exchange, leading to a denial of service due to a process crash or service disruption.\n\nCVE-2026-18726:\n\tA flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.\n\nCVE-2026-18725:\n\topen-iscsi: open-iscsi: Out-of-bounds access in iscsiuio ICMPv6 echo handling\n\nCVE-2026-18724:\n\topen-iscsi: open-iscsi: Stack buffer overflow in idbm record parsing",
  "published": "2026-08-17T08:47:33Z",
  "severity": "important",
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "iscsi-initiator-utils",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "iscsi-initiator-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "iscsi-initiator-utils-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "iscsi-initiator-utils-devel",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "iscsi-initiator-utils-iscsiuio",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "iscsi-initiator-utils-iscsiuio-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "open-iscsi",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.1.8-1\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-18724",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-18724",
      "released": "2026-09-14T12:56:55Z"
    },
    {
      "platform": "linux",
      "product": "open-iscsi",
      "release": "Debian 14",
      "fixedVersion": "2.1.13-1",
      "fix": "DEBIAN-CVE-2026-18724",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-18724",
      "released": "2026-09-14T12:56:55Z"
    },
    {
      "platform": "linux",
      "product": "python3-iscsi-initiator-utils",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-iscsi-initiator-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "6.2.1.4-10.git2a8f9d8.amzn2023.0.4",
      "fix": "ALAS2023-2026-2120",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2120",
      "released": "2026-08-31T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}