# CVE-2026-18724: open-iscsi vulnerability 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. - Web page: https://patchblox.com/security/cve/CVE-2026-18724 - Priority: High - CVSS: n/a (important) - EPSS: n/a - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 17, 2026 ## Description Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-18728: A flaw was found in open-iscsi. An integer underflow vulnerability in the `iscsiuio` 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 `iscsiuio` process crashing. This issue affects systems where `iscsiuio` is actively handling IPv4 DHCP traffic. CVE-2026-18727: A flaw was found in open-iscsi's 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. CVE-2026-18726: A 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. CVE-2026-18725: open-iscsi: open-iscsi: Out-of-bounds access in iscsiuio ICMPv6 echo handling CVE-2026-18724: open-iscsi: open-iscsi: Stack buffer overflow in idbm record parsing ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | iscsi-initiator-utils amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | iscsi-initiator-utils-debuginfo amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | iscsi-initiator-utils-debugsource amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | iscsi-initiator-utils-devel amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | iscsi-initiator-utils-iscsiuio amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | iscsi-initiator-utils-iscsiuio-debuginfo amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | open-iscsi Debian 12.15 (bookworm) | 2.1.8-1+deb12u1 | [DEBIAN-CVE-2026-18724](https://patchblox.com/security/data/fix/linux/debian-cve-2026-18724.md) | Sep 14, 2026 | | Linux | open-iscsi Debian 14 | 2.1.13-1 | [DEBIAN-CVE-2026-18724](https://patchblox.com/security/data/fix/linux/debian-cve-2026-18724.md) | Sep 14, 2026 | | Linux | python3-iscsi-initiator-utils amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | | Linux | python3-iscsi-initiator-utils-debuginfo amzn 2023 | 6.2.1.4-10.git2a8f9d8.amzn2023.0.4 | [ALAS2023-2026-2120](https://patchblox.com/security/data/fix/linux/alas2023-2026-2120.md) | Aug 31, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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