{"id":"CVE-2026-18511","state":"PUBLISHED","title":"IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension","description":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.","publishedAt":"2026-08-13T20:43:37.477Z","updatedAt":"2026-08-14T13:48:42.524Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"ibm"},"assigner":"ibm","products":["IBM i"],"affected":[{"vendor":"IBM","product":"i","versions":[{"version":"7.6","status":"affected"},{"version":"7.5","status":"affected"},{"version":"7.4","status":"affected"},{"version":"7.3","status":"affected"}],"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:*:*:*:*:*:*:*"]}],"references":["https://www.ibm.com/support/pages/node/7283285"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/18xxx/CVE-2026-18511.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18511","state":"PUBLISHED","datePublished":"2026-08-13T20:43:37.477Z","dateUpdated":"2026-08-14T13:48:42.524Z","assignerShortName":"ibm","assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateReserved":"2026-07-31T17:24:47.213Z"},"containers":{"cna":{"title":"IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension","descriptions":[{"lang":"en","value":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash."}],"affected":[{"vendor":"IBM","product":"i","versions":[{"version":"7.6","status":"affected"},{"version":"7.5","status":"affected"},{"version":"7.4","status":"affected"},{"version":"7.3","status":"affected"}],"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:*:*:*:*:*:*:*"]}],"references":[{"url":"https://www.ibm.com/support/pages/node/7283285","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":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","baseSeverity":"HIGH","baseScore":7.3,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"ibm","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateUpdated":"2026-08-13T20:43:37.477Z"},"solutions":[{"lang":"en","value":"IBM strongly recommends addressing the vulnerability now.\n\nIBM i Release5770-JV1\nPTF Number(s)PTF Download Link(s)7.6SJ11036\nSJ11072\nSJ11082\nSJ11088 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088 7.5SJ11068\nSJ11073\nSJ11070\nSJ11077\nSJ11087\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087 7.4SJ11071\nSJ11069\nSJ11076\nSJ11086\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086 7.3SJ11067\nSJ11075\nSJ11085\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075 \n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085 \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-JV1<br/>PTF Number(s)</strong></td><td><strong>PTF Download Link(s)</strong></td></tr></thead><tbody><tr><td>7.6</td><td>SJ11036<br/>SJ11072<br/>SJ11082<br/>SJ11088</td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088</a></td></tr><tr><td>7.5</td><td>SJ11068<br/>SJ11073<br/>SJ11070<br/>SJ11077<br/>SJ11087<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087</a></td></tr><tr><td>7.4</td><td>SJ11071<br/>SJ11069<br/>SJ11076<br/>SJ11086<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086</a></td></tr><tr><td>7.3</td><td>SJ11067<br/>SJ11075<br/>SJ11085<br/></td><td><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075</a><br/><a href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085\" rel=\"nofollow\">https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085</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>"}]}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-14T13:36:34.392328Z","id":"CVE-2026-18511","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-14T13:48:42.524Z"}}]}}}