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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-15 · updated 2026-10-26
• Weakness: CWE-385

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.

Affected products

• Legion of the Bouncy Castle Inc. BC-JAVA: from 1.71 before 1.80.2; from 1.81 before 1.81.1; from 1.82 before 1.84 — fixed in 1.80.2, 1.81.1, 1.84

How to fix

Upgrade to a fixed version: Legion of the Bouncy Castle Inc. BC-JAVA 1.80.2, 1.81.1, 1.84. Check the vendor advisory for mitigations.

References

• https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5
• https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598
• https://access.redhat.com/errata/RHSA-2026:12267
• https://access.redhat.com/errata/RHSA-2026:12269
• https://access.redhat.com/errata/RHSA-2026:18054
• https://access.redhat.com/errata/RHSA-2026:18055
• https://access.redhat.com/errata/RHSA-2026:18059
• https://access.redhat.com/errata/RHSA-2026:53644
• https://access.redhat.com/errata/RHSA-2026:53645
• https://access.redhat.com/errata/RHSA-2026:53646
• https://access.redhat.com/security/cve/CVE-2026-5598

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