Cyber Resilience

CVE-2026-5598

HighUpdated

Published: 15 April 2026

Published
15 April 2026
Modified
30 June 2026
KEV Added
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Patch
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CVSS Score v4 8.9 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 Score 0.0051 39.7th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-5598 is a high-severity Covert Timing Channel (CWE-385) vulnerability in Redhat (inferred from references). Its CVSS base score is 8.9 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Credential Access (T1212); ranked at the 39.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

1.84.

CWE(s)
CWE-385

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Why these techniques?

CWE-385 timing side-channel in Frodo KEM implementation directly enables key recovery (credential access) via local observation of execution timing differences.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

Affected Assets

Redhat
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-31 Covert Channel Analysis
addresses: CWE-385

Directly targets covert timing channels by requiring identification and bandwidth estimation, enabling mitigation that reduces or eliminates their usability.

References