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Bouncy Castle BC-JAVA Critical Flaws Allow Security Bypass

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Summary

CERT-Bund issued security advisory WID-SEC-2026-1129 identifying multiple critical vulnerabilities (CVSS Base Score 9.0) in Bouncy Castle BC-JAVA cryptographic library versions prior to 1.84. Attackers could exploit these flaws to bypass cryptographic security measures, disclose confidential information, or cause denial-of-service conditions. The vulnerabilities affect systems running Linux, macOS X, UNIX, Windows, and other operating systems that implement the affected library.

Published by CERT-Bund on wid.cert-bund.de . Detected, standardized, and enriched by GovPing. Review our methodology and editorial standards .
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What changed

CERT-Bund published advisory WID-SEC-2026-1129 disclosing critical vulnerabilities in Open Source Bouncy Castle BC-JAVA versions earlier than 1.84. The vulnerabilities carry a CVSS Base Score of 9.0 (critical) and a Temporal Score of 7.8 (high), with no remote attack capability confirmed. Mitigation measures are available.

Organizations using Bouncy Castle BC-JAVA in Java applications or systems should immediately identify affected implementations, assess exposure to security bypass or data disclosure risks, and apply available patches or workarounds to remediate the vulnerabilities.

Archived snapshot

Apr 16, 2026

GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.

[WID-SEC-2026-1129] Bouncy Castle BC-JAVA: Mehrere Schwachstellen CVSS Base Score 9.0 (kritisch) CVSS Temporal Score 7.8 (hoch) Remoteangriff nein Datum 15.04.2026 Stand 16.04.2026 Mitigation ja

Betroffene Systeme

Betriebssystem

  • Linux
  • MacOS X
  • Sonstiges
  • UNIX
  • Windows

Produktbeschreibung

Bouncy Castle ist eine Kryptographie-API für Java.

Produkte

15.04.2026
- Open Source Bouncy Castle <1.84

Angriff

Angriff

Ein Angreifer kann mehrere Schwachstellen in Bouncy Castle BC-JAVA ausnutzen, um kryptografische Sicherheitsvorkehrungen zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen. CVE Informationen Versionshistorie Feedback zum Advisory geben

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Data Privacy & Cybersecurity

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Classification

Agency
CERT-Bund
Published
April 15th, 2026
Instrument
Guidance
Legal weight
Non-binding
Stage
Final
Change scope
Substantive
Document ID
WID-SEC-2026-1129

Who this affects

Applies to
Technology companies Manufacturers
Industry sector
5112 Software & Technology
Activity scope
Vulnerability disclosure Security advisory Cryptographic implementation
Geographic scope
Germany DE

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Topics
Data Privacy Software & Technology

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