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CVE-2026-5598

CRITICAL CVSS 4.0: 10.0
Updated Apr 17, 2026
Java
Parameter Value
CVSS 10.0 (CRITICAL)
Affected Versions before 1.84.
Type CWE-385
Vendor Java
Public PoC No

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). Non-constant time comparisons risk private key leakage in FrodoKEM.

This issue affects BC-JAVA: from 2.17.3 before 1.84.

Attack Parameters

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

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)