UBUNTU-CVE-2026-5598

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-5598
Published: 15 Apr 2026, 10:16
Last modified:30 Jun 2026, 18:17

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.9 CRITICAL
4.0 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Apr 2026, 10:16
Published
Vulnerability first disclosed
30 Jun 2026, 18:17
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•CRITICAL•Score: 9.9CVSS: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
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Systems

  • ubuntu•bouncycastle

    all | all | all

References (3)