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 | 2026-06-30 03:21:08 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 1.80.2, from 1.81 before 1.81.1, from 1.82 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: 0.006910000 probability, percentile 0.482800000 (date 2026-07-02)
Problem Types: CWE-385 | CWE-385 CWE-385 Covert timing channel | 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... |
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
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
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vendor Declared Affected Products
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 | |
| access.redhat.com/errata/RHSA-2026:18054 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:12269 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:18059 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5 | 91579145-5d7b-4cc5-b925-a0262ff19630 | github.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5598.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:12267 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-5598 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87 | 91579145-5d7b-4cc5-b925-a0262ff19630 | github.com | |
| access.redhat.com/errata/RHSA-2026:18055 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.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 and Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH) (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-04-15T10:01:04.531Z | Reported to Red Hat. |
| ADP | 2026-04-15T09:05:56.277Z | Made public. |
Solutions
ADP: RHSA-2026:12267: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server, Red Hat JBoss EAP 7.4 ELS for RHEL 8, Red Hat JBoss EAP 7.4 ELS for RHEL 9
ADP: RHSA-2026:18054: Red Hat JBoss EAP 8.1 for RHEL 8
ADP: RHSA-2026:18055: Red Hat JBoss EAP 8.1 for RHEL 9
ADP: RHSA-2026:12269: Red Hat JBoss Enterprise Application Platform 7
ADP: RHSA-2026:18059: Red Hat JBoss Enterprise Application Platform 8.1
Workarounds
ADP: To mitigate this vulnerability, implement aggressive rate limiting and anomaly detection, specifically looking for unusual, high-frequency cryptographic handshake failures or anomalous traffic patterns targeting endpoints that handle key exchanges in the network logs.