Home/CVE/Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulne
CVE

CVE-2026-5598

Covert timing channel vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA core on all (core modules). This vulne

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 1.80.1, from 1.82 before 1.84.

EPSS 0.00022
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-385Covert Timing Channel
▤

Affected Packages

3
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.bouncycastle:bcprov-jdk14 HIGH fixed in 1.84
Maven org.bouncycastle:bcprov-jdk15to18 HIGH fixed in 1.84
Maven org.bouncycastle:bcprov-jdk18on HIGH fixed in 1.84
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Scoring & Timeline

Published to NVD15 Apr 2026 · 10:16 AM
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

9
suse-csafSUSE-SU-2026:1639-1
suse-csafopenSUSE-SU-2026:20627-1
suse-csafSUSE-SU-2026:21404-1
suse-csafopenSUSE-SU-2026:10571-1
rhsaRHSA-2026:18054Important
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5
https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598
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