# CVE-2026-73101: Apache Juneau: Internal exception class and message disclosed via error response header and body regardless of secure defaults

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Generation of Error Message Containing Sensitive Information vulnerability in Apache Juneau.

The REST server sends the internal exception class and message to clients in a "Thrown" response header on every error response, and can include internal exception messages in the error body, even when stack-trace rendering is disabled. This reveals implementation details to remote clients.

This issue affects Apache Juneau: through 9.2.0.

Users are recommended to upgrade to version 9.2.1, which fixes the issue.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache Juneau (org.apache.juneau:juneau-rest-server.): ≥ 0; < 9.2.1 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 4.0: 10 (critical); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H; source: CNA: apache

- 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://lists.apache.org/thread.html/j05q7vw08j48o96tdlzcsd4sozx1lyl6 (CNA: apache; vendor-advisory)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-73101; retrieved 2026-11-05; source updated 2026-11-05

Revision: be5ba6e80478c70c59b44bce1de14d91c94e2982ff9271a9180c2c06abb92278

Canonical: https://y2.dev/cve/CVE-2026-73101

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