High severity · published Apr 15, 2026
CVE-2026-5598
Non-constant time comparisons risk private key leakage in FrodoKEM.
7.5
CVSS
0.9%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BC
BC-JAVA · Legion of the Bouncy Castle Inc.
1.71 before 1.80.2; 1.81 before 1.81.1; 1.82 before 1.84 · source: vendor
RH
Red Hat Fuse 7 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform 8.1.7.GA · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5598
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5598
github.com
https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5
github.com
https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87
github.com
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:12267
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:12269
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:18054
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