CVE-2026-66257

HIGH CVSS 3.1: 7.5 EPSS 0.43%
Updated Aug 07, 2026
Apache
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions before 0.35.0
Fixed In 0.35.0
Type CWE-770 (Allocation Without Limits)
Vendor Apache
Public PoC No

A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion 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 Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Apache Qpid_Proton-J
cpe:2.3:a:apache:qpid_proton-j:*:*:*:*:*:*:*:*
0.35.0