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CVE-2026-83395 Oracle Corporation CVE debrief

CVE-2026-83395 is a medium-severity vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition. It allows unauthenticated attackers with network access to compromise these products, potentially leading to unauthorized data changes or partial DOS. Defenders should prioritize verifying exposure and applying patches or mitigations. The CVE record was published on 2026-10-20T21:23:44.691Z and has not been modified since then. This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandBox

Vendor
Oracle Corporation
Product
Oracle Java SE
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-20
Original CVE updated
2026-10-22
Advisory published
2026-10-20
Advisory updated
2026-10-22

Who should care

Defenders responsible for Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition deployments, especially those using affected versions, should assess exposure and prioritize patching or mitigations.

Why it matters

CVE-2026-83395 is a medium-severity vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition, allowing unauthenticated attackers to compromise these products and cause unauthorized data changes or partial DOS. Defenders should prioritize verifying exposure and applying patches or mitigations.

  • Potential unauthorized updates, inserts, or deletions to accessible data
  • Partial denial of service (DOS) of Oracle Java SE, Oracle GraalVM for JDK, or Oracle GraalVM Enterprise Edition
  • Need for verification of affected versions in deployments
  • Potential for exploitation through APIs in the specified component

Technical summary

CVE-2026-83395 is a vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition, allowing unauthenticated attackers with network access to compromise these products. Successful attacks can result in unauthorized updates, inserts, or deletions to some accessible data and partial denial of service (DOS). The vulnerability affects Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1.

Defensive priority

Defenders should prioritize verifying exposure of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition deployments, especially those using affected versions, and apply patches or mitigations as recommended by Oracle.

Recommended defensive actions

  • Verify Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition deployments for affected versions
  • Apply patches or mitigations recommended by Oracle
  • Monitor for unauthorized updates, inserts, or deletions to accessible data
  • Implement partial denial of service (DOS) mitigations
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and Oracle advisory provide details on the vulnerability, affected versions, and potential impacts. However, additional information on exploitation or victim organizations is not available in the supplied corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83395 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83395

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-83395 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83395

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-83395

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/83xxx/CVE-2026-83395.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://www.oracle.com/security-alerts/cpuoct2026.html

    Supplemental source - vendor-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.