Vulnerability-Lookup

CVE-2026-18511 (GCVE-0-2026-18511)

Vulnerability from cvelistv5 – Published: 2026-08-13 20:43 – Updated: 2026-08-14 13:48

Title

IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension

Summary

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.

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 13:36 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

ibm mitre root Scorecard

References

1 reference

URL	Tags
https://www.ibm.com/support/pages/node/7283285	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version
IBM	i	Affected: 7.6 Affected: 7.5 Affected: 7.4 Affected: 7.3 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:::::::*

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                  "value": "\u003cp\u003eIBM 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.\u003c/p\u003e"
                }
              ],
              "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."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                "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": "2026-08-13T20:43:37.477Z",
            "orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
            "shortName": "ibm"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://www.ibm.com/support/pages/node/7283285"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003e\u003cstrong\u003eIBM strongly recommends addressing the vulnerability now.\u003c/strong\u003e\u003c/p\u003e\u003cdiv\u003e\u003ctable\u003e\u003ccolgroup\u003e\u003ccol/\u003e\u003ccol/\u003e\u003ccol/\u003e\u003c/colgroup\u003e\u003cthead\u003e\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eIBM i Release\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003e5770-JV1\u003cbr/\u003ePTF Number(s)\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003ePTF Download Link(s)\u003c/strong\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003e7.6\u003c/td\u003e\u003ctd\u003eSJ11036\u003cbr/\u003eSJ11072\u003cbr/\u003eSJ11082\u003cbr/\u003eSJ11088\u003c/td\u003e\u003ctd\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e7.5\u003c/td\u003e\u003ctd\u003eSJ11068\u003cbr/\u003eSJ11073\u003cbr/\u003eSJ11070\u003cbr/\u003eSJ11077\u003cbr/\u003eSJ11087\u003cbr/\u003e\u003c/td\u003e\u003ctd\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e7.4\u003c/td\u003e\u003ctd\u003eSJ11071\u003cbr/\u003eSJ11069\u003cbr/\u003eSJ11076\u003cbr/\u003eSJ11086\u003cbr/\u003e\u003c/td\u003e\u003ctd\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e7.3\u003c/td\u003e\u003ctd\u003eSJ11067\u003cbr/\u003eSJ11075\u003cbr/\u003eSJ11085\u003cbr/\u003e\u003c/td\u003e\u003ctd\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075\u003c/a\u003e\u003cbr/\u003e\u003ca href=\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085\" rel=\"nofollow\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/table\u003e\u003c/div\u003e\u003cp\u003eIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.\u003c/p\u003e"
                }
              ],
              "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."
            }
          ],
          "title": "IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
        "assignerShortName": "ibm",
        "cveId": "CVE-2026-18511",
        "datePublished": "2026-08-13T20:43:37.477Z",
        "dateReserved": "2026-07-31T17:24:47.213Z",
        "dateUpdated": "2026-08-14T13:48:42.524Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

EUVD-2026-352425

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:21

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:21:18.975268+00:00",
  "id": "EUVD-2026-352425"
}

FKIE_CVE-2026-18511

Vulnerability from fkie_nvd - Published: 2026-08-13 21:17 - Updated: 2026-08-17 13:25

Severity

7.3 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	psirt@us.ibm.com	https://www.ibm.com/support/pages/node/7283285	Vendor Advisory

Impacted products

Vendor	Product	Version
ibm	i	7.3
ibm	i	7.4
ibm	i	7.5
ibm	i	7.6

JSON

To clipboard

{
  "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"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "DD4F4919-D935-4B81-B4E8-0E0F2DAC09B1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*",
              "matchCriteriaId": "AE2B298C-E1F6-43BD-A5EF-83964C6669CE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*",
              "matchCriteriaId": "88B74622-BDB2-43AE-A91F-FADEC4B64B4F",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*",
              "matchCriteriaId": "8C189EC3-7D9F-4303-BB5C-1013FAE59B1E",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-18511",
  "lastModified": "2026-08-17T13:25:20.297",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.4,
        "source": "psirt@us.ibm.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-18511",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-14T13:36:34.392328Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-13T21:17:45.220",
  "references": [
    {
      "source": "psirt@us.ibm.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.ibm.com/support/pages/node/7283285"
    }
  ],
  "sourceIdentifier": "psirt@us.ibm.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "psirt@us.ibm.com",
      "type": "Secondary"
    }
  ]
}

GHSA-7484-CP4G-HRJ6

Vulnerability from github – Published: 2026-08-13 21:36 – Updated: 2026-08-13 21:36

Details

Severity

7.3 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18511"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T21:17:45Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-7484-cp4g-hrj6",
  "modified": "2026-08-13T21:36:14Z",
  "published": "2026-08-13T21:36:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18511"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7283285"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}

WID-SEC-W-2026-2820

Vulnerability from csaf_certbund - Published: 2026-08-12 22:00 - Updated: 2026-08-13 22:00

Summary

IBM i: Mehrere Schwachstellen

Severity

Hoch

Scope

86 vulnerabilities in this advisory, including CVE-2026-18511.

CVE-2026-18511

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-18511 (GCVE-0-2026-18511)

EUVD-2026-352425

FKIE_CVE-2026-18511

GHSA-7484-CP4G-HRJ6

WID-SEC-W-2026-2820

Tags

Sightings

Nomenclature

Related by attack behaviour