---
id: "CVE-2026-87398"
kind: "vulnerability"
aliases: ["CVE-2026-87398"]
title: "Oracle Outside In: unauthenticated network request crashes or hangs the library"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["fusion-middleware", "java", "oracle", "outside-in", "package", "self-hosted"]
not_affected_if: ["no-oracle-fusion-middleware"]
published_at: "2026-10-20T22:20:18+00:00"
first_seen_at: "2026-10-23T21:57:25+00:00"
updated_at: "2026-10-25T03:18:45+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87398", "first_seen_at": "2026-10-23T21:57:25+00:00"}]
---

# Oracle Outside In: unauthenticated network request crashes or hangs the library

Oracle Outside In Technology, a file-parsing library in Oracle Fusion Middleware, has a flaw that an unauthenticated remote attacker can trigger over HTTP. The result is a repeatable hang or crash that denies service to the application using it.

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

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87398

## From the sources

Vulnerability in the Oracle Outside In Technology product of Oracle Fusion Middleware (component: Outside In Core).   The supported version that is affected is 8.5.8. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Outside In Technology.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Outside In Technology. CVSS 3.1 Base Score 7.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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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_