CVE-2026-66274

Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.77%Up 0.6 points since Aug 5, 2026

What each source reports

CVE List Score used 7.5

Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

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.

Record: CVE-2026-66274
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-674
Updated: 2026-11-02

EUVDEUVD-2026-53082 7.5

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.

Record: EUVD-2026-53082
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-p2gc-fm5w-94jj 7.5

Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

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.

Record: GHSA-p2gc-fm5w-94jj
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-674
Updated: 2026-11-03

NVD 7.5

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.

Record: CVE-2026-66274
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-674
Updated: 2026-11-02

OSV 7.5

Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

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.

Record: CVE-2026-66274
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-674
Updated: 2026-11-03

OSVGHSA-p2gc-fm5w-94jj 7.5

Apache Qpid Proton-J: Unbounded type nesting can lead to pre-authentication stackoverflow

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.

Record: GHSA-p2gc-fm5w-94jj
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-674
Updated: 2026-11-03

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.apache.qpid:proton-j` Maven	before 0.35.0	0.35.0
`org.apache.qpid:proton-j` Maven	before 0.35.0, plus listed versions 0.100.11.00.11.10.12.00.12.1 Show 45 moreShow less 0.12.20.13.00.13.10.14.00.15.00.16.00.17.00.18.00.19.00.20.00.21.00.22.00.23.00.24.00.25.00.26.00.27.00.27.10.27.20.27.30.28.00.28.10.29.00.30.00.31.00.32.00.33.00.33.10.33.100.33.20.33.30.33.40.33.50.33.60.33.70.33.80.33.90.34.00.34.10.40.50.60.70.80.9	0.35.0

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected, references	OSV
Nov 3, 2026	affected, facts, references	GitHub Advisories
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-66274 is a high vulnerability (CVSS 7.5) in Apache Qpid Proton-j, published August 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.77%, the 55th percentile. Fixed in org.apache.qpid:proton-j 0.35.0.

References

This page doesn't list everything

Left out here: 1 version. The JSON record has them.