Bouncy Castle for Java Vulnerability in PKCS#8 and PBES2 Decryptors
CVE-2026-15055

5.3MEDIUM

Key Information:

Vendor

Legion Of The Bouncy Castle Inc.

Status
Bc-java
Bc-lts-java
Bc-fja
Vendor
CVE Published:
3 August 2026

What is CVE-2026-15055?

A vulnerability in Bouncy Castle for Java allows unbounded KDF cost parameters to be honored by PKCS#8 and PBES2 decryptors. This issue poses a risk as it may lead to resource exhaustion or denial of service attacks when processing encrypted data. Users of specific versions of Bouncy Castle should ensure they update to the latest versions to mitigate this vulnerability and bolster their cryptographic safeguards.

Affected Version(s)

BC-FJA all 1.0.0 < 1.0.12

BC-FJA all 2.0.0 < 2.0.12

BC-FJA all 2.1.0 < 2.1.12

References

https://github.com/bcgit/bc-java/wiki/CVE-2026-15055
vendor-advisory
https://github.com/bcgit/bc-java/commit/7ab4ee67a01359500...
patch

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alex Gaynor in collaboration with Claude and Anthropic Research
.