HIGH

CVE-2026-66274

CVSS v3

7.5

HIGH

EPSS Score

0.8 %

exploit probability, as of 2026-10-17

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2026-66274 Red Hat Product Security7 products fixed · 2 known affected
org.apache.qpid/proton-j: Apache Qpid Proton-J: Denial of Service via unbounded type nesting
proton-j as a component of Red Hat build of Apache Camel 4 for Quarkus 3 · proton-j as a component of Red Hat JBoss Enterprise Application Platform Expansion Pack
RHSA-2026:71675 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.18.4 for Spring Boot release.
RHSA-2026:69459 Red Hat Product Security1 product fixed
Red Hat Security Advisory: AMQ Clients 2026.Q3
RHSA-2026:66545 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat AMQ Broker 7.13.6 release and security update
RHSA-2026:66488 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat AMQ Broker 7.14.1 release and security update
RHSA-2026:63302 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.18 for Quarkus 3.33 update is now available (RHBQ 3.33.3.SP1)

2 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-08-05
Last Modified: 2026-08-06

Frequently asked questions

What is CVE-2026-66274?

Is CVE-2026-66274 actively exploited?

Active exploitation of CVE-2026-66274 has not been confirmed. Its EPSS score was 0.8% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-66274?

CVE-2026-66274 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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