---
id: "CVE-2026-91417"
kind: "vulnerability"
aliases: ["CVE-2026-91417"]
title: "Oracle Java SE: CORBA flaw lets unauthenticated network attackers cause partial denial of service"
severity: "medium"
cvss: 5.3
epss: 0.00306
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["graalvm", "java", "oracle-jdk", "runtime", "self-hosted"]
not_affected_if: ["default-config"]
published_at: "2026-10-20T22:20:45+00:00"
first_seen_at: "2026-10-23T21:57:26+00:00"
updated_at: "2026-10-25T12:38:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91417", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91417", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Java SE: CORBA flaw lets unauthenticated network attackers cause partial denial of service

A flaw in the CORBA component of Oracle Java SE and GraalVM Enterprise Edition can be triggered by sending crafted data to its APIs over the network, such as through a web service. A successful attack causes a partial denial of service and no confidentiality or integrity loss, per the CVSS vector.

_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 builds `8u503` and `8u503-perf`, and GraalVM Enterprise `21.3.19.1.1`.
- Check whether the application uses CORBA APIs (for example, `org.omg.CORBA` or the IIOP stack) fed by network input; the sources do not say how to confirm this more precisely.

## Fix

- Move Oracle Java SE off `8u503` and `8u503-perf` to the patched release named in Oracle's Critical Patch Update advisory (the sources do not give the version number).
- Move Oracle GraalVM Enterprise Edition off `21.3.19.1.1` to the patched release (unknown from the sources).

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91417
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91417

## From the sources

Vulnerability in the Oracle Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: CORBA).  Supported versions that are affected are Oracle Java SE: 8u503 and  8u503-perf; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM Enterprise Edition.  Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM Enterprise Edition. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.3 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

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