In a nutshell: Vulnerabilities in the Bouncy Castle cryptographic library allow attackers to decrypt data and forge digital signatures; immediate patching is necessary.
The German Federal Office for Information Security (BSI) is warning of security gaps in the widely used Bouncy Castle cryptographic library. These enable attackers to decrypt encrypted data and forge digital signatures.
The vulnerabilities in Bouncy Castle affect the core functionality of the library: encryption and digital signatures. Attackers could exploit these gaps to decrypt data that should be protected by the cryptographic system. Additionally, there is a risk that manipulated or forged certificates will be accepted as valid.
Bouncy Castle is an established cryptographic library used in many enterprise systems, Java applications, and security-critical infrastructures. The gaps therefore endanger the protection of sensitive data in a multitude of products and systems that build on this library.
The BSI recommends immediately deploying available security updates for Bouncy Castle and all affected dependent applications and systems. CISOs should conduct an inventory of Bouncy Castle usage in their organization and prioritize rolling out the patches.
Source: www.security-insider.de · Published July 17, 2026
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