---
id: "CVE-2026-114820"
kind: "vulnerability"
aliases: ["CVE-2026-114820"]
title: "Oracle Java SE JSSE: unauthenticated network attacker gains full data access"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["graalvm", "java", "jdk", "oracle", "poc-public", "runtime", "self-hosted", "web-services"]
not_affected_if: ["patched-jdk-build"]
published_at: "2026-10-24T19:17:04+00:00"
first_seen_at: "2026-10-24T19:23:38+00:00"
updated_at: "2026-10-25T02:59:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114820", "first_seen_at": "2026-10-24T19:23:38+00:00"}, {"source": "github-poc", "url": "https://github.com/joedayz/cve-2026-114820-java-scan", "first_seen_at": "2026-10-24T19:38:53+00:00"}]
---

# Oracle Java SE JSSE: unauthenticated network attacker gains full data access

A flaw in the JSSE component of Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition lets an unauthenticated attacker over the network create, modify, delete or read data handled by the JDK. A public proof-of-concept scanner exists on GitHub.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `java -version` and compare against the affected releases: 8u511, 11.0.33.0.2, 17.0.21.0.2, 21.0.13.0.2, 25.0.5.0.2, 27.0.1.0.2.
- Check GraalVM builds with `native-image --version` or the GraalVM release string against 17.0.21.0.2, 21.0.13.0.2 and 21.3.20.0.2.
- Find bundled JDKs in application images and servers, not only the system JDK.

## Fix

- Move Oracle Java SE to the Oracle Critical Patch Update release that fixes this CVE; the sources do not name the fixed build.
- Move GraalVM for JDK or GraalVM Enterprise to the patched release from Oracle's advisory.
- Rebuild and redeploy container images that embed a JDK.

## Timeline

- 2026-10-24T19:23:38+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-114820
- 2026-10-24T19:38:53+00:00 github-poc https://github.com/joedayz/cve-2026-114820-java-scan

## Documents

- [poc] joedayz/cve-2026-114820-java-scan https://github.com/joedayz/cve-2026-114820-java-scan

## From the sources

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE).  Supported versions that are affected are Oracle Java SE: 8u511-b32, 8u511-perf-b32, 11.0.33.0.2, 17.0.21.0.2, 21.0.13.0.2, 25.0.5.0.2, 27.0.1.0.2; Oracle GraalVM for JDK: 17.0.21.0.2 and  21.0.13.0.2; Oracle GraalVM Enterprise Edition: 21.3.20.0.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition.  Successful attacks of this vulnerability can result in  unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as  unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: 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 sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_