CVE-2026-18846 is a buffer overflow vulnerability (CWE-787) affecting IBM i versions 7.3 through 7.6. The flaw arises from improper validation of client-supplied data, allowing a remote attacker to send malformed requests to one of the host servers. Exploitation can lead to an out-of-bounds write, resulting in denial of service conditions for the targeted server. The vulnerability has a CVSS 3.1 base score of 7.5, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.

Successful exploitation of this vulnerability can cause a denial of service on the affected IBM i host server by triggering a buffer overflow condition. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented in the provided data. Until a patch is available, consider restricting access to the affected host servers to trusted clients only to reduce exposure.