10.0
CRITICAL
CVSS 4.0
CVE-2026-5598
Non-constant time comparisons risk private key leakage in FrodoKEM.
Overview
Description
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.
Details
INFO
Published Date :
April 15, 2026, 10:16 a.m.
Last Modified :
June 30, 2026, 3:21 a.m.
Remotely Exploit :
Yes !
Source :
91579145-5d7b-4cc5-b925-a0262ff19630
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | ||||
| CVSS 4.0 | CRITICAL | 91579145-5d7b-4cc5-b925-a0262ff19630 | ||||
| CVSS 4.0 | CRITICAL | 91579145-5d7b-4cc5-b925-a0262ff19630 | ||||
| CVSS 4.0 | HIGH | 91579145-5d7b-4cc5-b925-a0262ff19630 |
Solution
Update Legion of the Bouncy Castle BC-JAVA core to a patched version to address timing channel vulnerabilities.
- Update BC-JAVA core to version 1.84 or later.
- Ensure FrodoKEM implementations use constant-time comparisons.
- Consult vendor advisories for specific patches and guidance.
Public PoC/Exploit Available at Github
CVE-2026-5598 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-5598.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5598 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-5598
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A reference implementation of Clean Architecture, CQRS, and Resilience patterns using Spring Boot and Azure/AWS
Java
Updated: 1 month, 3 weeks ago
0 stars
0 fork
0 watcher
Born at : April 7, 2026, 2:40 p.m.
This repo has been linked 5 different CVEs too.
None
Updated: 2 weeks, 6 days ago
0 stars
0 fork
0 watcher
Born at : March 28, 2026, 9:59 a.m.
This repo has been linked 15 different CVEs too.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5598 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-5598 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss EAP 7.4 ELS for RHEL 8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss EAP 8.1 for RHEL 8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss EAP 7.4 ELS for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss EAP 8.1 for RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:7', 'cpe:/a:redhat:jboss_enterprise_application_platform:7.4'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 7', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8.1', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_fuse:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Fuse 7', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:cryostat:4'], 'vendor': 'Red Hat', 'product': 'Cryostat 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:ocp_tools'], 'vendor': 'Red Hat', 'product': 'OpenShift Developer Tools and Services', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_broker:7'], 'vendor': 'Red Hat', 'product': 'Red Hat AMQ Broker 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_clients:2023'], 'vendor': 'Red Hat', 'product': 'Red Hat AMQ Clients', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:camel_quarkus:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apache Camel 4 for Quarkus 3', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:camel_spring_boot:4'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apache Camel for Spring Boot 4', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:apicurio_registry:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Apicurio Registry 3', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:debezium:2'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Debezium 2', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:debezium:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Debezium 3', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:build_keycloak:'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Keycloak', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:quarkus:3'], 'vendor': 'Red Hat', 'product': 'Red Hat build of Quarkus', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_data_grid:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Data Grid 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:8'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:9'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux 9', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_bpms_platform:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Process Automation 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:satellite:6'], 'vendor': 'Red Hat', 'product': 'Red Hat Satellite 6', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:red_hat_single_sign_on:7'], 'vendor': 'Red Hat', 'product': 'Red Hat Single Sign-On 7', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_streams:2'], 'vendor': 'Red Hat', 'product': 'streams for Apache Kafka 2', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:amq_streams:3'], 'vendor': 'Red Hat', 'product': 'streams for Apache Kafka 3', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-385 Added Reference https://access.redhat.com/errata/RHSA-2026:12267 Added Reference https://access.redhat.com/errata/RHSA-2026:12269 Added Reference https://access.redhat.com/errata/RHSA-2026:18054 Added Reference https://access.redhat.com/errata/RHSA-2026:18055 Added Reference https://access.redhat.com/errata/RHSA-2026:18059 Added Reference https://access.redhat.com/security/cve/CVE-2026-5598 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2458635 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5598.json -
CVE Modified by 91579145-5d7b-4cc5-b925-a0262ff19630
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/bcgit/bc-java', 'vendor': 'Legion of the Bouncy Castle Inc.', 'modules': ['core'], 'product': 'BC-JAVA', 'versions': [{'status': 'affected', 'version': '1.71', 'lessThan': '1.80.2', 'versionType': 'maven'}, {'status': 'affected', 'version': '1.81', 'lessThan': '1.81.1', 'versionType': 'maven'}, {'status': 'affected', 'version': '1.82', 'lessThan': '1.84', 'versionType': 'maven'}], 'platforms': ['all'], 'packageName': 'core', 'programFiles': ['FrodoEngine.java'], 'collectionURL': 'https://www.bouncycastle.org/download/bouncy-castle-java/', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-5598', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-15T13:11:48.318645Z'} -
CVE Modified by 91579145-5d7b-4cc5-b925-a0262ff19630
Jun. 14, 2026
Action Type Old Value New Value Changed Description 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 1.80.1, from 1.82 before 1.84. 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. -
CVE Modified by 91579145-5d7b-4cc5-b925-a0262ff19630
May. 19, 2026
Action Type Old Value New Value Changed Description 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 1.84. 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 1.80.1, from 1.82 before 1.84. -
CVE Modified by 91579145-5d7b-4cc5-b925-a0262ff19630
Apr. 21, 2026
Action Type Old Value New Value Added Reference https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598 Removed Reference https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905998 -
CVE Modified by 91579145-5d7b-4cc5-b925-a0262ff19630
Apr. 21, 2026
Action Type Old Value New Value Changed Description 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. 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 1.84. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:X/V:X/RE:X/U:Red Removed CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added Reference https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5 Added Reference https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87 -
New CVE Received by 91579145-5d7b-4cc5-b925-a0262ff19630
Apr. 15, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-385 Added Reference https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905998
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.