{"cve":"CVE-2026-18821","nvd":{"published":"2026-08-19T20:17:13.603","modified":"2026-08-25T20:40:39.927","status":"Analyzed","description":"IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 Power Systems Firmware is affected by a vulnerability in partition firmware during network boot. An unauthenticated attacker on the same network as a partition undergoing network boot can send a malformed packet, allowing arbitrary code to be executed in the partition firmware and compromising everything subsequently loaded by that partition. Other partitions and the managed system are not affected. Only partitions actively performing a network boot are affected, resulting in a confidentiality, integrity, and availability impact.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-787"],"references":["https://www.ibm.com/support/pages/node/7283232"],"products":["ibm:power_system_e1050_\\(9043-mrx\\)_firmware","ibm:power_system_e1080_\\(9080-hex\\)_firmware","ibm:power_system_e1150_\\(9043-mru\\)_firmware","ibm:power_system_e1180_\\(9080-heu\\)_firmware","ibm:power_system_e950_\\(9040-mr9\\)_firmware","ibm:power_system_e980_\\(9080-m9s\\)_firmware","ibm:power_system_h922_\\(9223-22s\\)_firmware","ibm:power_system_h924_\\(9223-42s\\)_firmware","ibm:power_system_l1022_\\(9786-22h\\)_firmware","ibm:power_system_l1024_\\(9786-42h\\)_firmware","ibm:power_system_l1122_\\(9856-22h\\)_firmware","ibm:power_system_l1124_\\(9856-42h\\)_firmware","ibm:power_system_s1012_\\(9028-21b\\)_firmware","ibm:power_system_s1014_\\(9105-41b\\)_firmware","ibm:power_system_s1022_\\(9105-22a\\)_firmware","ibm:power_system_s1022s_\\(9105-22b\\)_firmware","ibm:power_system_s1024_\\(9105-42a\\)_firmware","ibm:power_system_s1112_\\(9242-21b\\)_firmware","ibm:power_system_s1112_\\(9242-21t\\)_firmware","ibm:power_system_s1114_\\(9824-41b\\)_firmware","ibm:power_system_s1122_\\(9824-22a\\)_firmware","ibm:power_system_s1122s_\\(9824-22b\\)_firmware","ibm:power_system_s1124_\\(9824-42a\\)_firmware","ibm:power_system_s914_\\(9009-41g\\)_firmware","ibm:power_system_s922_\\(9009-22g\\)_firmware","ibm:power_system_s924_\\(9009-42g\\)_firmware"],"source":"nvd","synced_at":"2026-10-19T22:49:38.260478770+00:00"},"epss":{"cve":"CVE-2026-18821","score":0.00285,"percentile":0.21093,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}