Review reviewHigh

CVE-2026-5598

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

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.

CVSS: 8.9
EPSS: 0.69%
CISA KEV: Not listed
Published: 2026.04.15

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.69%

Technical severityCVSS 8.9

Vulnerability overview

Affected product and versions

Product: 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
Affected versions: >= 1.71 < 1.80.2, >= 1.81 < 1.81.1, >= 1.82 < 1.84
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that 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 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:4.0/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
CWE: CWE-385