Denial of Service Vulnerability in Bouncy Castle for Java
CVE-2026-13586

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-2026-13586?

A vulnerability exists in Bouncy Castle for Java prior to version 1.85 that can lead to a Denial of Service (DoS) condition. This issue arises from an improper handling of PKCS#12 MAC and bag-decryption Key Derivation Function (KDF) iteration-count, which can allow attackers to exploit the vulnerability and potentially disrupt services. It is also pertinent in the Long-Term Support (LTS) versions and specific FIPS configurations of Bouncy Castle prior to their respective patched versions.

Affected Version(s)

BC-FJA all 1.0.0 < 1.0.2.7

BC-FJA all 2.0.0 < 2.0.2

BC-FJA all 2.1.0 < 2.1.3

References

https://github.com/bcgit/bc-java/wiki/CVE-2026-13586
vendor-advisory
https://github.com/bcgit/bc-java/commit/fa59cc23502f73def...
patch
https://github.com/bcgit/bc-java/commit/75d60dfb4ca72bea6...
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

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