Bouncy Castle für Java: Mehrere Schwachstellen
WID-SEC-2026-3726 · first 05.10.2026 · updated 22.10.2026 · CVSS 9,4
What it is about
Bouncy Castle ist eine Kryptographie-API für Java. Ein Angreifer kann mehrere Schwachstellen in Bouncy Castle für Java ausnutzen, um seine Privilegien zu erhöhen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren und offenzulegen oder einen Denial-of-Service-Zustand auszulösen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- seine Privilegien zu erhöhen
- Sicherheitsmaßnahmen zu umgehen
- Daten zu manipulieren
- offenzulegen oder einen Denial-of-Service-Zustand auszulösen
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- IBM SPSS Modeler
- SUSE Linux
- SUSE openSUSE
- Open Source Bouncy Castle Java LTS <2.73.13
- Open Source Bouncy Castle Java <1.86
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source Bouncy Castle Java LTS 2.73.13
- Open Source Bouncy Castle Java 1.86
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- GitHub Advisory Database vom 2026-10-04 github.com
- Red Hat Security Advisory RHSA-2026:83082 vom 2026-10-15 access.redhat.com
- Red Hat Security Advisory RHSA-2026:83670 vom 2026-10-16 access.redhat.com
- Red Hat Security Advisory RHSA-2026:83520 vom 2026-10-15 access.redhat.com
- SUSE Security Update SUSE-SU-2026:4797-1 vom 2026-10-21 lists.suse.com
- openSUSE Security Update OPENSUSE-SU-2026:12090-1 vom 2026-10-21 lists.opensuse.org
- IBM Security Bulletin 7293295 vom 2026-10-21 www.ibm.com
- Red Hat Security Advisory RHSA-2026:88150 vom 2026-10-22 access.redhat.com
CVE: CVE-2026-18040, CVE-2026-71883, CVE-2026-71885, CVE-2026-71886, CVE-2026-71887, CVE-2026-71888, CVE-2026-71889, CVE-2026-71890, CVE-2026-71891, CVE-2026-71892, CVE-2026-85515, CVE-2026-97873
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.