CVE-2026-5598: Non-constant time comparisons risk private key leakage in FrodoKEM.

Published Apr 15, 2026
·
Updated

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.

Other sources

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.

— Red Hat

Affected Software

3 affected components
Bouncy Castle BC-JAVA>=1.71<1.80.2, >=1.81<1.80.1, >=1.82<1.84, >=2.17.3<1.84
IBM MQ Operator<=SC2: v3.2.0 - v3.2.23 CD:  v3.3.0, v3.4.0, v3.4.1, v3.5.0, v3.5.1 - v3.5.3, v3.6.0 - v3.6.4, v3.7.0 - v3.7.2, v3.8.0, v3.8.1, v3.9.0, v3.9.1 LTS: v2.0.0 - 2.0.29
IBM supplied MQ Advanced container images<=SC2: 9.4.0.6-r1, 9.4.0.6-r2, 9.4.0.7-r1, 9.4.0.10-r1, 9.4.0.10-r2, 9.4.0.11-r1, 9.4.0.11-r2, 9.4.0.11-r3, 9.4.0.12-r1, 9.4.0.15-r1 - 9.4.0.15-r4, 9.4.0.16-r1, 9.4.0.16-r2, 9.4.0.17-r1, 9.4.0.17-r2, 9.4.0.20-r1CD: 9.4.1.0-r1, 9.4.1.0-r2, 9.4.1.1-r1, 9.4.2.0-r1, 9.4.2.0-r2, 9.4.2.1-r1, 9.4.2.1-r2, 9.4.3.0-r1, 9.4.3.0-r2, 9.4.3.1-r1 - 9.4.3.1-r3, 9.4.4.0-r1 - 9.4.4.0-r4, 9.4.4.1-r1, 9.4.5.0-r1, 9.4.5.0-r2LTS: 9.3.0.0-r1, 9.3.0.0-r2, 9.3.0.0-r3, 9.3.0.1-r1, 9.3.0.1-r2, 9.3.0.1-r3, 9.3.0.1-r4, 9.3.0.3-r1, 9.3.0.4-r1, 9.3.0.4-r2, 9.3.0.5-r1, 9.3.0.5-r2, 9.3.0.5-r3, 9.3.0.6-r1, 9.3.0.10-r1, 9.3.0.10-r2, 9.3.0.11-r1,9.3.0.11-r2, 9.3.0.15-r1, 9.3.0.16-r1, 9.3.0.16-r2, 9.3.0.17-r1, 9.3.0.17-r2, 9.3.0.17-r3, 9.3.0.20-r1, 9.3.0.20-r2, 9.3.0.21-r1, 9.3.0.21-r2, 9.3.0.21-r3, 9.3.0.25-r1, 9.4.0.0-r1, 9.4.0.0-r2, 9.4.0.0-r3, 9.4.0.5-r1, 9.4.0.5-r2

Event History

Apr 15, 2026
CVE Published
via MITRE·09:05 AM
Data Sourced
via MITRE·09:05 AM
DescriptionWeakness
Data Sourced
via Red Hat·10:01 AM
DescriptionSeverityAffected Software
Data Sourced
via NVD·10:16 AM
DescriptionSeverityWeakness
May 15, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-5598?

CVE-2026-5598 is classified as a critical vulnerability due to the risk of private key leakage.

2

How do I fix CVE-2026-5598?

To fix CVE-2026-5598, update Bouncy Castle BC-JAVA to version 1.84 or later.

3

What types of comparisons are affected by CVE-2026-5598?

CVE-2026-5598 specifically affects non-constant time comparisons.

4

Which versions of Bouncy Castle BC-JAVA are affected by CVE-2026-5598?

CVE-2026-5598 impacts Bouncy Castle BC-JAVA versions prior to 1.84.

5

What is the risk associated with CVE-2026-5598?

The risk associated with CVE-2026-5598 includes potential exposure of private keys through timing attacks.

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