Vulnerability-Lookup

GHSA-H635-RRQM-4MJQ

Vulnerability from github – Published: 2026-10-26 15:34 – Updated: 2026-10-26 15:34

Details

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.

Severity

4.5 (Medium)


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

2.0 (Low)


                  
                    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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-116486"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-386"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-26T14:16:37Z",
    "severity": "LOW"
  },
  "details": "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.",
  "id": "GHSA-h635-rrqm-4mjq",
  "modified": "2026-10-26T15:34:44Z",
  "published": "2026-10-26T15:34:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116486"
    },
    {
      "type": "WEB",
      "url": "https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/easymock/objenesis"
    },
    {
      "type": "WEB",
      "url": "https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/ObjenesisBase.java#L92-L95"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-116486 (GCVE-0-2026-116486)

Vulnerability from cvelistv5 – Published: 2026-10-26 13:08 – Updated: 2026-10-26 16:15

Title

Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

Summary

Severity

2 (Low)


                        
                          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

4.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-26 15:38 UTC

CWE

CWE-386 - Symbolic Name not Mapping to Correct Object

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6966 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/easymock/objenesis/commit/40f9…	patch
https://github.com/easymock/objenesis/security/ad…	vendor-advisory
https://github.com/easymock/objenesis/blob/fb36e5…	technical-description
https://github.com/easymock/objenesis	product
https://www.vulncheck.com/advisories/objenesis-be…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
easymock	objenesis	Affected: 0 , < 3.6 (custom) Unaffected: 3.6 (custom)

Date Public

2026-10-26 00:00

Credits

Yu Bao, PayPal Cyber Security Team

Show details on NVD website

JSON

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                "role": "CISA Coordinator",
                "timestamp": "2026-10-26T15:38:10.344457Z",
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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.

Vulnerability timeline

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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.
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