Non-constant time comparisons risk private key leakage in FrodoKEM.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.9epss 0.7%
exploitation probability
0.7%top 51% of all CVEs
observed exploitation
nono source reports it
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: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
Affected products
Legion of the Bouncy Castle Inc. · BC-JAVAReferences
https://access.redhat.com/errata/RHSA-2026:12267https://access.redhat.com/errata/RHSA-2026:12269https://access.redhat.com/errata/RHSA-2026:18054https://access.redhat.com/errata/RHSA-2026:18055https://access.redhat.com/errata/RHSA-2026:18059https://access.redhat.com/security/cve/CVE-2026-5598https://bugzilla.redhat.com/show_bug.cgi?id=2458635https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5598.json