Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

{
  "id": "b950bfb3e97febe6f875b446c59ca2953636f6284034aa1edaa098823df799f1",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116486",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache",
    "summary": "Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.",
    "evidence": "cve:CVE-2026-116486",
    "products": [
      {
        "name": {
          "value": "objenesis",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-116486",
      "aliases": [
        "CVE-2026-116486"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 2,
            "attackVector": "LOCAL",
            "baseSeverity": "LOW",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "LOW",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW"
          }
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 4.5,
            "attackVector": "LOCAL",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
            "integrityImpact": "LOW",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "availabilityImpact": "LOW",
            "privilegesRequired": "LOW",
            "confidentialityImpact": "LOW"
          }
        }
      ],
      "affected": [
        {
          "vendor": "easymock",
          "product": "objenesis",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "3.6",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "3.6",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:maven/org.objenesis/objenesis",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-26T16:15:59.231Z",
      "provider": "cve",
      "references": [
        "https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c",
        "https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff",
        "https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/ObjenesisBase.java#L92-L95",
        "https://github.com/easymock/objenesis",
        "https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-116486",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-26T15:38:10.344457Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-26T16:15:59.231Z"
            }
          }
        ],
        "cna": {
          "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
          "shortName": "VulnCheck",
          "dateUpdated": "2026-10-26T13:08:52.051Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116486",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 318567,
  "published_at": "2026-10-26T13:08:52.051+00:00"
}