CVE-2026-66257

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

05/08/2026

Last modified:

07/08/2026

Description

A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to denial of service.<br /> <br /> This issue affects Apache Qpid Proton-J: through 0.34.1.<br /> <br /> Users are recommended to upgrade to version 0.35.0, which fixes the issue.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High