CVE-2026-5598: BC-JAVA core (<1.84) timing channel leak FrodoKEM
CVE-2026-5598 Published on April 15, 2026

Non-constant time comparisons risk private key leakage in FrodoKEM.
Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulnerability is associated with program files FrodoEngine.Java. This issue affects BC-JAVA: from 1.71 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-5598 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Type

Covert Timing Channel

Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.


Products Associated with CVE-2026-5598

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-5598 are published in these products:

Bouncycastle Bc Java
 
Red Hat Jboss Enterprise Application Platform Els
 
Red Hat Jboss Enterprise Application Platform
 
Red Hat Jboss Fuse
 
Red Hat Cryostat
 
Red Hat Ocp Tools
 
Red Hat Amq Broker
 
Red Hat Amq Clients
 
Red Hat Camel Quarkus
 
Red Hat Camel Spring Boot
 
Red Hat Apicurio Registry
 
Red Hat Debezium
 
Red Hat Build Keycloak
 
Red Hat Quarkus
 
Red Hat Jboss Data Grid
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Jbosseapxp
 
Red Hat Openshift Ai
 
Red Hat Openshift Devspaces
 
Red Hat Jboss Enterprise Bpms Platform
 
Red Hat Satellite
 
Red Hat Single Sign On
 
Red Hat Amq Streams
 

Affected Versions

Legion of the Bouncy Castle Inc. BC-JAVA: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9: Red Hat JBoss Enterprise Application Platform 8.1: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9: Red Hat Cryostat 4: Red Hat OpenShift Developer Tools and Services: Red Hat OpenShift Developer Tools and Services: Red Hat OpenShift Developer Tools and Services: Red Hat OpenShift Developer Tools and Services: Red Hat AMQ Broker 7: Red Hat AMQ Broker 7: Red Hat AMQ Clients: Red Hat AMQ Clients: Red Hat build of Apache Camel 4 for Quarkus 3: Red Hat build of Apache Camel for Spring Boot 4: Red Hat build of Apache Camel for Spring Boot 4: Red Hat build of Apache Camel for Spring Boot 4: Red Hat build of Apache Camel for Spring Boot 4: Red Hat build of Apicurio Registry 3: Red Hat build of Apicurio Registry 3: Red Hat build of Debezium 2: Red Hat build of Debezium 2: Red Hat build of Debezium 3: Red Hat build of Debezium 3: Red Hat build of Debezium 3: Red Hat Build of Keycloak: Red Hat build of Quarkus: Red Hat Data Grid 8: Red Hat Data Grid 8: Red Hat Data Grid 8: Red Hat Data Grid 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat Fuse 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift Dev Spaces: Red Hat OpenShift Dev Spaces: Red Hat Process Automation 7: Red Hat Process Automation 7: Red Hat Satellite 6: Red Hat Satellite 6: Red Hat Single Sign-On 7: Red Hat streams for Apache Kafka 2: Red Hat streams for Apache Kafka 2: Red Hat streams for Apache Kafka 3: Red Hat streams for Apache Kafka 3:

Exploit Probability

EPSS
0.51%
Percentile
39.50%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.