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CVE-2026-5598

Severity8.9 High CVSS 4.0 2 scores
Fixed in1.80.2
WeaknessCWE-385
Published15 Apr 2026
Updated26 Oct 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 1.2% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: bcgit/bc-java 8692e6b.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5 : a commit: the change itself

CVSS

8.9 HIGH v4.0 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/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 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 4.0 8.9 HIGH 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/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 bcorg Secondary published
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N redhat-SADP Secondary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Fusion Middleware / Rest Converters (Bouncy Castle Java Library) (12.2.1.4.0)
Oracle Critical Patch Update July 2026 ↗ CPU 2026-Q3 Oracle Fusion Middleware / Centralized Thirdparty Jars (Bouncy Castle Java Library) (12.2.1.4.0, 14.1.1.0.0)
Oracle Fusion Middleware / Third Party (Bouncy Castle Java Library) (14.1.2.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Fusion Middleware Centralized Thirdparty Jars (Bouncy Castle Java Library) 12.2.1.4.0, 14.1.1.0.0 12.2.1.4.0 · 14.1.1.0.0
Oracle Fusion Middleware Rest Converters (Bouncy Castle Java Library) 12.2.1.4.0 12.2.1.4.0
Oracle Fusion Middleware Third Party (Bouncy Castle Java Library) 14.1.2.0.0 14.1.2.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.bouncycastle:bcprov-jdk15to18 1.71 1.80.2 unbounded
org.bouncycastle:bcprov-jdk14 1.71 1.84 unbounded
org.bouncycastle:bcprov-jdk18on 1.82 1.84 unbounded
org.bouncycastle:bcprov-jdk18on 1.81 1.84 unbounded
org.bouncycastle:bcprov-jdk18on 1.71 1.80.2 unbounded

Products and versions

3 products, 5 version entries
SourceVendorProductSchemeAffected versions
osv org.bouncycastle bcprov-jdk14 generic ≥ 1.71 and < 1.84
osv org.bouncycastle bcprov-jdk15to18 generic ≥ 1.71 and < 1.80.2
osv org.bouncycastle bcprov-jdk18on generic ≥ 1.71 and < 1.80.2 · ≥ 1.81 and < 1.84 · ≥ 1.82 and < 1.84

References

URLTags
https://github.com/bcgit/bc-java/commit/8692e6b2b191fc4aafa32545c7a78bdb9bf110c5 commit
https://github.com/bcgit/bc-java/commit/94abbd56413dfdac651fd878bc60253871ef5e87 WEB
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5598.json WEB
https://github.com/bcgit/bc-java/wiki/CVE-2026-5598 WEB
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905598 WEB
https://github.com/bcgit/bc-java PACKAGE
https://bugzilla.redhat.com/show_bug.cgi?id=2458635 WEB
https://access.redhat.com/security/cve/CVE-2026-5598 WEB
https://access.redhat.com/errata/RHSA-2026:53806 WEB
https://access.redhat.com/errata/RHSA-2026:53646 WEB

Timeline

Published2026-04-15By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.