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TI-2026-42546 Aliases CVE-2026-59651GHSA-mwmr-38hj-q7gm

BKS keystore accepts legacy version with 16-bit integrity MAC key

Priority LOW 31CWE-326Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 13 fixed, 11 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-326.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00196 9th percentileScored 2026-11-07
Fix Partial BC-JAVA (Legion of the Bouncy Castle Inc.): 1.85BC-LTS-JAVA (Legion of the Bouncy Castle Inc.): 2.73.12Red Hat: 13 advisoriesRed Hat: 13 fixed, 11 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Legion of the Bouncy Castle Inc.BC-JAVAbefore 1.851.85Patch availableCNA
Legion of the Bouncy Castle Inc.BC-LTS-JAVA2.73.0 to before 2.73.122.73.12Patch availableCNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*before 1.85VulnerableLegion of the Bouncy Castle Inc.
cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts:*:*:*:*:*:*:*:*up to 2.73.11VulnerableLegion of the Bouncy Castle Inc.

Remediation

  • Fix · CNA BC-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 1.85
  • Fix · CNA BC-LTS-JAVA (Legion of the Bouncy Castle Inc.) Fixed in 2.73.12

Red Hat 13 advisories

  • RHSA-2026:95887 Released 2026-11-06 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.9 security update
    • Red Hat JBoss Enterprise Application Platform 8.1
  • RHSA-2026:90321 Released 2026-10-26 · Red Hat rating Critical
    Red Hat OpenShift Dev Spaces 3.31.0 Release.
    • Red Hat OpenShift Dev Spaces 3.31 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/jetbrains-ide-rhel9 +8
  • RHSA-2026:88159 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.17 security update.
    • OpenShift Developer Tools and Services 4.17 registry.redhat.io/ocp-tools-4/jenkins-rhel9
Show 10 more Red Hat advisories
  • RHSA-2026:88158 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.19 security update.
    • OpenShift Developer Tools and Services 4.19 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:88157 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.20 security update.
    • OpenShift Developer Tools and Services 4.20 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:88156 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.16 security update.
    • OpenShift Developer Tools and Services 4.16 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:88155 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.21 security update.
    • OpenShift Developer Tools and Services 4.21 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:88154 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.22 security update.
    • OpenShift Developer Tools and Services 4.22 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:88153 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.18 security update.
    • OpenShift Developer Tools and Services 4.18 registry.redhat.io/ocp-tools-4/jenkins-rhel9
  • RHSA-2026:88151 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.14 security update.
    • OpenShift Developer Tools and Services 4.14 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:88152 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.12 security update.
    • OpenShift Developer Tools and Services 4.12 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:88149 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.13 security update.
    • OpenShift Developer Tools and Services 4.13 registry.redhat.io/ocp-tools-4/jenkins-rhel8
  • RHSA-2026:88150 Released 2026-10-22 · Red Hat rating Critical
    Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.15 security update.
    • OpenShift Developer Tools and Services 4.15 registry.redhat.io/ocp-tools-4/jenkins-rhel8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Legion of the Bouncy Castle BC-JAVA 1.85

    32 records Highest priority Priority MEDIUM 23 MEDIUM, 9 LOW

    Other records, highest priority first

    • TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer valuePriority MEDIUM 48
    • TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-inPriority MEDIUM 48
    • TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificatePriority MEDIUM 48
    Show all 32 records →
  • Release ·

    Legion of the Bouncy Castle BC-LTS-JAVA 2.73.12

    28 records Highest priority Priority MEDIUM 20 MEDIUM, 8 LOW

    Other records, highest priority first

    • TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer valuePriority MEDIUM 48
    • TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-inPriority MEDIUM 48
    • TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificatePriority MEDIUM 48
    Show all 28 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift Developer Tools and ServicesAffectedNo fix yet
Red Hat AMQ Broker 7AffectedNo fix yet
Red Hat Build of KeycloakAffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Fuse 7AffectedNo fix planned: Out of support scope
Red Hat JBoss Enterprise Application Platform 7AffectedNo fix planned: Will not fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Will not fix
Red Hat Single Sign-On 7AffectedNo fix planned: Will not fix
Red Hat build of Apache Camel for Spring Boot 4AffectedNo fix yet
Red Hat build of Apicurio Registry 3AffectedNo fix yet
OpenShift Developer Tools and Services 4.12Fixed RHSA-2026:88152
OpenShift Developer Tools and Services 4.13Fixed RHSA-2026:88149
OpenShift Developer Tools and Services 4.14Fixed RHSA-2026:88151
OpenShift Developer Tools and Services 4.15Fixed RHSA-2026:88150
OpenShift Developer Tools and Services 4.16Fixed RHSA-2026:88156
OpenShift Developer Tools and Services 4.17Fixed RHSA-2026:88159
OpenShift Developer Tools and Services 4.18Fixed RHSA-2026:88153
OpenShift Developer Tools and Services 4.19Fixed RHSA-2026:88158
OpenShift Developer Tools and Services 4.20Fixed RHSA-2026:88157
OpenShift Developer Tools and Services 4.21Fixed RHSA-2026:88155
OpenShift Developer Tools and Services 4.22Fixed RHSA-2026:88154
Red Hat JBoss Enterprise Application Platform 8.1Fixed RHSA-2026:95887
Red Hat OpenShift Dev Spaces 3.31Fixed RHSA-2026:90321
Not affected: 22 products
  • OpenShift Developer Tools and Services 4.12
  • OpenShift Developer Tools and Services 4.13
  • OpenShift Developer Tools and Services 4.14
  • OpenShift Developer Tools and Services 4.15
  • OpenShift Developer Tools and Services 4.16
  • OpenShift Developer Tools and Services 4.17
  • OpenShift Developer Tools and Services 4.18
  • OpenShift Developer Tools and Services 4.19
  • OpenShift Developer Tools and Services 4.20
  • OpenShift Developer Tools and Services 4.21
  • OpenShift Developer Tools and Services 4.22
  • Red Hat AMQ Clients
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Fuse 7
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift Dev Spaces 3.31
  • Red Hat Satellite 6
  • Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat build of Quarkus

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59651
  2. 2026-10-03 Alias added: GHSA-mwmr-38hj-q7gm
  3. 2026-10-10 Affected versions changed · Red Hat
  4. 2026-10-16 Affected versions changed · Red Hat
  5. 2026-10-23 Fix available: RHSA-2026:88149 · Red Hat
  6. 2026-10-23 Fix available: RHSA-2026:88152 · Red Hat
  7. 2026-10-23 Fix available: RHSA-2026:88150 · Red Hat
  8. 2026-10-23 Fix available: RHSA-2026:88156 · Red Hat
  9. 2026-10-23 Fix available: RHSA-2026:88153 · Red Hat
  10. 2026-10-23 Fix available: RHSA-2026:88154 · Red Hat
  11. 2026-10-23 Fix available: RHSA-2026:88157 · Red Hat
  12. 2026-10-23 Fix available: RHSA-2026:88155 · Red Hat
  13. 2026-10-23 Fix available: RHSA-2026:88151 · Red Hat
  14. 2026-10-23 Fix available: RHSA-2026:88158 · Red Hat
  15. 2026-10-23 Fix available: RHSA-2026:88159 · Red Hat
  16. 2026-10-23 Fix available: OpenShift Developer Tools and Services 4.12, OpenShift Developer Tools and Services 4.13, OpenShift Developer Tools and Services 4.14 +8 · Red Hat
  17. 2026-10-29 Fix available: Red Hat OpenShift Dev Spaces 3.31 · Red Hat
  18. 2026-10-30 Fix available: RHSA-2026:90321 · Red Hat
  19. 2026-11-06 Fix available: RHSA-2026:95887 · Red Hat
  20. 2026-11-06 Fix available: Red Hat JBoss Enterprise Application Platform 8.1 · Red Hat

References

Patch 1

Advisory 1

  • TI-2018-15967 Legion of the Bouncy Castle Legion of the Bouncy Castle Java Cryptography APIs 1.58 up to… CVSS 3.1CRITICAL 9.8
  • TI-2017-09736 BouncyCastle JCE TLS Bleichenbacher/ROBOT CVSS 3.0HIGH 7.5
  • TI-2026-42545 MTI/A0 DH agreement exponentiates unvalidated peer value CVSS 4.0CRITICAL 9.3
  • TI-2026-42533 JSSE hostname verifier CN-fallback enabled by default despite documented opt-in CVSS 4.0CRITICAL 9.3
  • TI-2026-41816 Stapled OCSP response accepted without binding to the checked certificate CVSS 4.0CRITICAL 9.3
  • TI-2026-07701 Name Constraints bypass via trailing dot in rfc822Name and URI CVSS 4.0CRITICAL 9.3
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences