# CVE-2026-73095: Apache Juneau: Denial of service via unbounded memory allocation in parsers and REST request handling

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

Allocation of Resources Without Limits or Throttling vulnerability in Apache Juneau.

The MessagePack parser, which the REST server enables by default, sizes buffers from length values in the input. An unauthenticated client can send a few bytes that force a multi-gigabyte allocation and an OutOfMemoryError, causing denial of service. Related unbounded allocations in REST request handling (multipart uploads and request reader buffers) are fixed at the same time.

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-marshall): ≥ 0; < 9.2.1 (affected, semver). Source: CNA: apache
- 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: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: apache

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-770

## 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-2026-73095; retrieved 2026-11-05; source updated 2026-11-05

Revision: 3dfb6684c3c396752aa51c07dab6591766020878defa80c7a34dc95a93071329

Canonical: https://y2.dev/cve/CVE-2026-73095

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