# CVE-2026-120971: Org.jboss.resteasy/resteasy-core: resteasy: information disclosure through default exception mapper responses

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Red Hat / Red Hat build of Apache Camel 4 for Quarkus 3 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apicurio Registry 3 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Debezium 3 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Build of Keycloak (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Quarkus (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Fuse 7 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8 (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (resteasy-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Satellite 6 (candlepin): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: redhat

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-209

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-120971 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2565584 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-120971 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2565584 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-120971; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120971; retrieved 2026-11-03; source updated 2026-11-03

Revision: 9c12b6767ad1a1a3b5d687c4c5267da221f334d2d10493e0bbd88e251dabe65f

Canonical: https://y2.dev/cve/CVE-2026-120971

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