---
id: CVE-2026-120971
title: >-
  Org.jboss.resteasy/resteasy-core: resteasy: information disclosure through
  default exception mapper responses
summary: >-
  A flaw was found in RESTEasy's default exception mapper. When an unhandled
  exception other than a WebApplicationException is not handled by an
  application exception mapper, RESTEasy returns the exception's localized
  message in the HTTP 5…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-209
vendor: Red Hat
product: resteasy-core
affected:
  - resteasy-core (all versions)
  - resteasy-core (all versions)
  - resteasy-core (all versions)
  - resteasy-core (all versions)
  - resteasy-core (all versions)
  - resteasy-core
  - resteasy-core (all versions)
  - resteasy-core (all versions)
  - candlepin (all versions)
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-03T17:52:20.970664Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T18:33:19.110Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120971'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-120971'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2565584'
    label: RHBZ#2565584
tags:
  - cve.org
epss: 0.00343
epssPercentile: 0.28027
ingestedAt: '2026-11-05T20:33:06.369Z'
---

## Overview

A flaw was found in RESTEasy's default exception mapper. When an unhandled exception other than a WebApplicationException is not handled by an application exception mapper, RESTEasy returns the exception's localized message in the HTTP 500 response body. A remote unauthenticated attacker who can trigger such an exception may obtain information contained in that message. The behavior was reproduced with RESTEasy 7.0.2.Final.

## Affected

- `resteasy-core (all versions)`
- `resteasy-core (all versions)`
- `resteasy-core (all versions)`
- `resteasy-core (all versions)`
- `resteasy-core (all versions)`
- `resteasy-core`
- `resteasy-core (all versions)`
- `resteasy-core (all versions)`
- `candlepin (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.