IBM i 7.6, 7.5, 7.4, and 7.3 s vulnerable to a buffer overflow from improperly validating client data. By sending malformed requests to one of the host servers, a remote attacker could leverage this vulnerability to cause a denial-of-server (DoS) for that server.
"}],"value":"IBM i 7.6, 7.5, 7.4, and 7.3 s vulnerable to a buffer overflow from improperly validating client data. By sending malformed requests to one of the host servers, a remote attacker could leverage this vulnerability to cause a denial-of-server (DoS) for that server."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-13T18:58:23.163Z","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","shortName":"ibm"},"references":[{"tags":["vendor-advisory","patch"],"url":"https://www.ibm.com/support/pages/node/7283578"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"IBM strongly recommends addressing the vulnerability now.
Host Servers
Debug Server
| IBM i Release | 5770-SS1 PTF Number(s) | PTF Download Link(s) |
| 7.6 | SJ10899 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10899 |
Telnet
| IBM i Release | 5770-SS1 PTF Number(s) | PTF Download Link(s) |
| 7.6 | SJ11022 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11022 |
DRDA/DDM
| IBM i Release | 5770-SS1 PTF Number(s) | PTF Download Link(s) |
| 7.6 | SJ10848 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10848 |
IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.
"}],"value":"IBM strongly recommends addressing the vulnerability now.\n\n\n\nHost Servers\n\nIBM i Release5770-SS1\nPTF Number(s)PTF Download Link(s)7.6SJ11101\nSJ11097 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11101 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11097 7.5SJ11102\nSJ11098\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11102 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11098 7.4SJ11103\nSJ11099\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11103 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11099 7.3SJ11104\nSJ11100\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11100 \n\n\n\n\n\n\n\nDebug Server\n\nIBM i Release5770-SS1\nPTF Number(s)PTF Download Link(s)7.6SJ10899 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10899 \n\n\n\n\n\n\n\nTelnet\n\nIBM i Release5770-SS1\nPTF Number(s)PTF Download Link(s)7.6SJ11022 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11022 \n\n\n\n\n\n\n\nDRDA/DDM\n\nIBM i Release5770-SS1\nPTF Number(s)PTF Download Link(s)7.6SJ10848 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10848 \n\n\n\n\n\n\n\nIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products."}],"title":"IBM i is Affected By Multiple Vulnerabilities in Host Servers"}},"cveMetadata":{"assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","assignerShortName":"ibm","cveId":"CVE-2026-18846","datePublished":"2026-08-13T18:58:23.163Z","dateReserved":"2026-08-04T15:07:01.355Z","dateUpdated":"2026-08-13T19:32:50.526Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-13 20:17:19","lastModifiedDate":"2026-08-17 15:28:53","problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":{"cvssMetricV31":[{"source":"psirt@us.ibm.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-13T19:32:41.002862Z","id":"CVE-2026-18846","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:i:*:*:*:*:*:*:*:*","versionStartIncluding":"7.3","versionEndIncluding":"7.6","matchCriteriaId":"46DEA5F3-B160-471F-8C4C-0E8338EDEDA5"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"18846","Ordinal":"1","Title":"IBM i is Affected By Multiple Vulnerabilities in Host Servers","CVE":"CVE-2026-18846","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"18846","Ordinal":"1","NoteData":"IBM i 7.6, 7.5, 7.4, and 7.3 s vulnerable to a buffer overflow from improperly validating client data. By sending malformed requests to one of the host servers, a remote attacker could leverage this vulnerability to cause a denial-of-server (DoS) for that server.","Type":"Description","Title":"IBM i is Affected By Multiple Vulnerabilities in Host Servers"}]}}}