CVE-2026-5598 PUBLISHED

Non-constant time comparisons risk private key leakage in FrodoKEM.

Assigner: bcorg
Reserved: 05.04.2026 Published: 15.04.2026 Updated: 15.04.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CVSS Score: 10

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Legion of the Bouncy Castle Inc.
Product	BC-JAVA
Versions	Default: unaffected affected from 2.17.3 to 1.84 (excl.)

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905998

Problem Types

CWE-385 Covert timing channel CWE