CVE-2026-5598

Aliases:GHSA-p93r-85wp-75v3
Advisory lineage Upstream: 0 Downstream: 6
Awaiting Analysis
Published: 15 Apr 2026, 09:05
Last modified:15 Jul 2026, 00:43

Vulnerability Summary

Overall Risk (default)
medium
36/100
CVSS Score
8.9 HIGH
v4.0 (cve.org)
EPSS Score
0.69% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Apr 2026, 09:05
Published
Vulnerability first disclosed
15 Jul 2026, 00:43
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v4.0•HIGH•Score: 8.9CVSS: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
  • v4.0•HIGH•Score: 8.9CVSS: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
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Trends

Current EPSS score: 0.69%• Percentile: 48%

Techniques & Countermeasures

  • CWE-385•Covert Timing Channel

    Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.

Affected Systems

  • legion of the bouncy castle inc.•bc-java

    ≥ 2.17.3, < 1.84 | ≥ 1.71, < 1.84 | ≥ 1.81, < 1.80.1 | ≥ 1.71, < 1.80.2 | ≥ 1.81, < 1.81.1 | ≥ 1.82, < 1.84

  • org.bouncycastle•bcprov-jdk14

    ≥ 1.71, < 1.84 | ≥ 1.81, < 1.81.1

  • org.bouncycastle•bcprov-jdk15to18

    ≥ 1.71, < 1.84 | ≥ 1.71, < 1.80.2

  • org.bouncycastle•bcprov-jdk18on

    ≥ 1.71, < 1.84 | ≥ 1.82, < 1.84

References (15)