{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18077", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "state": "PUBLISHED", "assignerShortName": "ibm", "dateReserved": "2026-07-28T15:12:51.754Z", "datePublished": "2026-08-13T20:41:56.635Z", "dateUpdated": "2026-08-13T20:41:56.635Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-08-13T20:41:56.635Z"}, "title": "IBM i is Affected By Multiple Vulnerabilities in Simple Mail Transfer Protocol", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write", "type": "CWE"}]}], "affected": [{"vendor": "IBM", "product": "i", "versions": [{"status": "affected", "version": "7.6"}, {"status": "affected", "version": "7.5"}, {"status": "affected", "version": "7.4"}, {"status": "affected", "version": "7.3"}], "cpes": ["cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to a stack-based buffer overflow.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to a stack-based buffer overflow.</p>"}]}], "references": [{"url": "https://www.ibm.com/support/pages/node/7283291", "tags": ["vendor-advisory", "patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}], "solutions": [{"lang": "en", "value": "IBM strongly recommends addressing the vulnerability now.\n\nIBM i Release5770-TC1\nPTF Number(s)PTF Download Link(s)7.6SJ11061\nSJ11131 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11061 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11131 7.5SJ11074\nSJ11129\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11074 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11129 7.4SJ11083\nSJ11127\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11083 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11127 7.3SJ11084\nSJ11123 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11084 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11123\u00a0 https://www.ibm.com/mysupport/s/fix-information \n\n\n\nIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p><strong>IBM strongly recommends addressing the vulnerability now.</strong></p><div><table><colgroup><col/><col/><col/></colgroup><thead><tr><td><strong>IBM i Release</strong></td><td><strong>5770-TC1<br/>PTF Number(s)</strong></td><td><strong>PTF Download Link(s)</strong></td></tr></thead><tbody><tr><td>7.6</td><td>SJ11061<br/>SJ11131</td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11061\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11061</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11131\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11131</a></td></tr><tr><td>7.5</td><td>SJ11074<br/>SJ11129<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11074\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11074</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11129\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11129</a></td></tr><tr><td>7.4</td><td>SJ11083<br/>SJ11127<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11083\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11083</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11127\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11127</a></td></tr><tr><td>7.3</td><td>SJ11084<br/>SJ11123</td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11084\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11084</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11123\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11123\u00a0</a></td></tr></tbody></table></div><p>IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.</p>"}]}]}}}

{}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*"], "product": "i", "vendor": "IBM", "versions": [{"status": "affected", "version": "7.6"}, {"status": "affected", "version": "7.5"}, {"status": "affected", "version": "7.4"}, {"status": "affected", "version": "7.3"}]}], "source": "psirt@us.ibm.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service due to a stack-based buffer overflow."}], "id": "CVE-2026-18077", "lastModified": "2026-08-13T21:17:44.230", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "psirt@us.ibm.com", "type": "Primary"}]}, "published": "2026-08-13T21:17:44.230", "references": [{"source": "psirt@us.ibm.com", "url": "https://www.ibm.com/support/pages/node/7283291"}], "sourceIdentifier": "psirt@us.ibm.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "psirt@us.ibm.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.3"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "i", "source": "cna", "vendor": "IBM"}, "product": "i", "vendor": "ibm"}], "created": "2026-08-13T22:45:03.561899+00:00", "updated": "2026-08-14T01:15:16.854611+00:00", "vendors": ["ibm", "ibm$PRODUCT$i"]}