CVE-2026-5598 HIGH

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

Vendor Legion Of The Bouncy Castle Inc.
Product BC-JAVA
Weakness CWE-385
Published April 15, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

8.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

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/S:P/AU:Y/U:Red

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 15, 2026 CVE published
June 30, 2026 Record updated