Non-constant time comparisons risk private key leakage in FrodoKEM.
Summary
| CVE | CVE-2026-5598 |
|---|---|
| State | PUBLISHED |
| Assigner | bcorg |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-15 10:16:49 UTC |
| Updated | 2026-04-21 16:16:20 UTC |
| 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 1.84. |
Risk And Classification
Primary CVSS: v4.0 8.9 HIGH from 91579145-5d7b-4cc5-b925-a0262ff19630
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
EPSS: 0.000180000 probability, percentile 0.047780000 (date 2026-04-22)
Problem Types: CWE-385 | CWE-385 CWE-385 Covert timing channel
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 91579145-5d7b-4cc5-b925-a0262ff19630 | Secondary | 8.9 | HIGH | 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/C... |
| 4.0 | CNA | CVSS | 8.9 | HIGH | 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... |
CVSS v4.0 Breakdown
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
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Legion Of The Bouncy Castle Inc. | BC-JAVA | affected 1.71 1.84 maven | all |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598 | 91579145-5d7b-4cc5-b925-a0262ff19630 | github.com | |
| github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5 | 91579145-5d7b-4cc5-b925-a0262ff19630 | github.com | |
| github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87 | 91579145-5d7b-4cc5-b925-a0262ff19630 | github.com | |
| github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905998 | MITRE | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Cristina Dueñas Navarro ([email protected]) (en)
CNA: Sunwoo Lee ([email protected]) Woohyun Choi ([email protected]) Seunghyun Yoon ([email protected]) Korea Institute of Energy Technology (KENTECH) (en)