VDB-386034 · CVE-2026-66276 · GCVE-0-2026-66276

Apache Qpid Proton-J up to 0.34.1 Disposition Range unchecked input for loop condition

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.1	$0-$5k	1.21+

Summaryinfo

A vulnerability described as problematic has been identified in Apache Qpid Proton-J up to 0.34.1. Affected by this vulnerability is an unknown functionality of the component Disposition Range Handler. The manipulation results in unchecked input for loop condition. This vulnerability is cataloged as CVE-2026-66276. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apache Qpid Proton-J up to 0.34.1. It has been classified as problematic. Affected is an unknown code block of the component Disposition Range Handler. The manipulation with an unknown input leads to a unchecked input for loop condition vulnerability. CWE is classifying the issue as CWE-606. The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping. This is going to have an impact on availability. CVE summarizes:

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, 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.

The advisory is available at lists.apache.org. This vulnerability is traded as CVE-2026-66276 since 07/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/05/2026). This vulnerability is assigned to T1449 by the MITRE ATT&CK project.

Upgrading to version 0.35.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Apache

Name

Qpid Proton-J

Version

License

open-source

Website

Vendor: https://www.apache.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Unchecked input for loop condition
CWE: CWE-606 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Qpid Proton-J 0.35.0

Timelineinfo

07/24/2026 CVE reserved
08/05/2026 +12 days Advisory disclosed
08/05/2026 +0 days VulDB entry created
08/05/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: lists.apache.org
Status: Confirmed

CVE: CVE-2026-66276 (🔒)
GCVE (CVE): GCVE-0-2026-66276
GCVE (VulDB): GCVE-100-386034

Entryinfo

Created: 08/05/2026 08:38
Changes: 08/05/2026 08:38 (54)
Complete: 🔍
Cache ID: 216::103