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CVE-2026-59651 Bouncy Castle for Java LTS

Affected softwareBouncy Castle for Java LTS
Severity7.1 High CVSS 4.0 2 scores
WeaknessCWE-326
Published3 Aug 2026
Updated2 Sep 2026

Description

In Bouncy Castle for Java before 1.85, BKS keystore accepts legacy version with 16-bit integrity MAC key. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

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 0.20% 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 faf5daa.

  • 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/faf5daa6e9b8460f862afc0af1cc0da365f7d4d2 : a commit: the change itself

CVSS

7.1 HIGH v4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:Amber 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 7.1 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:Amber bcorg Secondary published
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N NVD Primary

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 / NextGen Installer (Bouncy Castle Java Library) (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 14.1.2.1.0, 15.1.1.0.0)
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 NextGen Installer (Bouncy Castle Java Library) 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 14.1.2.1.0, 15.1.1.0.0 12.2.1.4.0 · 14.1.1.0.0 · 14.1.2.0.0 · 14.1.2.1.0 · 15.1.1.0.0
Oracle Fusion Middleware Third Party (Bouncy Castle Java Library) 14.1.2.0.0 14.1.2.0.0

Products and versions

2 products, 2 version entries
SourceVendorProductSchemeAffected versions
nvd bouncycastle bc-java generic < 1.85
nvd bouncycastle bouncy castle for java lts generic ≤ 2.73.11

References

URLTags
https://github.com/bcgit/bc-java/commit/faf5daa6e9b8460f862afc0af1cc0da365f7d4d2 commit
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059651 Third Party Advisory

Timeline

Published2026-08-03By the CVE Program.
NVD record modified2026-09-02NVD's own last-modified date for this record.