---
id: CVE-2026-66274
title: >-
  A pre-authentication attacker could leverage type nesting to cause a
  StackOverflowError potentially leading to denial of service.


  This issue affects Apache Qpid Proton-J: through 0.34.1.


  Users are recommended to upgrade to version 0.35…
summary: >-
  A pre-authentication attacker could leverage type nesting to cause a
  StackOverflowError potentially leading to denial of service.


  This issue affects Apache Qpid Proton-J: through 0.34.1.


  Users are recommended to upgrade to version 0.35…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-674
  - CWE-770
vendor: apache
product: qpid_proton-j
affected:
  - qpid_proton-j < 0.35.0
patched:
  - qpid_proton-j 0.35.0
published: '2026-08-05'
updated: '2026-08-07'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66274'
references:
  - url: 'https://lists.apache.org/thread/h7xolzws2by2qhdjf7scbx87foxojb5h'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/08/04/10'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-66274.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-66274'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2511337'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-66274'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66274'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66545'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66488'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63302'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69459'
  - url: 'https://access.redhat.com/errata/RHSA-2026:71675'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00774
epssPercentile: 0.53799
ingestedAt: '2026-08-08T20:29:49.101Z'
---

## Overview

A pre-authentication attacker could leverage type nesting to cause a StackOverflowError potentially leading to denial of service.

This issue affects Apache Qpid Proton-J: through 0.34.1.

Users are recommended to upgrade to version 0.35.0, which fixes the issue.

## Affected

- `qpid_proton-j < 0.35.0`

## Remediation

Upgrade past the affected range:

- `qpid_proton-j 0.35.0`

## Vendor advisories

- **RHSA-2026:66545** · Red Hat · fixed in: Red Hat AMQ Broker 7.13.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66545)
- **RHSA-2026:66488** · Red Hat · fixed in: Red Hat AMQ Broker 7.14.1 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66488)
- **RHSA-2026:63302** · Red Hat · fixed in: Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.3.SP1 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63302)
- **Red Hat VEX** · Important · affected: Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat JBoss Enterprise Application Platform Expansion Pack · no fix planned: Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat JBoss Enterprise Application Platform Expansion Pack · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-66274.json)
- **RHSA-2026:69459** · Red Hat · fixed in: AMQ Clients 2026.Q3 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69459)
- **RHSA-2026:71675** · Red Hat · fixed in: Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16 · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71675)