CVE-2026-13586
Received Received - Intake

Denial of Service in Bouncy Castle for Java

Publication date: 2026-08-03

Last updated on: 2026-08-03

Assigner: bcorg

Description
In Bouncy Castle for Java before 1.85, PKCS#12 MAC and bag-decryption KDF iteration-count bound (DoS). This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

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Meta Information

Published
2026-08-03
Last Modified
2026-08-03
Generated
2026-08-03
AI Q&A
2026-08-03
EPSS Evaluated
N/A
NVD
CVE-2026-13586
EUVD
EUVD-2026-52140

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
bouncy_castle bouncy_castle to 1.85 (exc)
bouncy_castle bouncy_castle_lts to 2.73.12 (exc)
bouncy_castle bc_fips to 1.0.2.7 (exc)
bouncy_castle bc_fips to 2.0.2 (exc)
bouncy_castle bc_fips to 2.1.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

This vulnerability in Bouncy Castle for Java versions before 1.85, LTS before 2.73.12, and FIPS before specified versions involves a weakness in the PKCS#12 MAC and bag-decryption key derivation function (KDF) iteration count. This could allow a denial-of-service (DoS) attack by exploiting the iteration count bound.

Detection Guidance

This vulnerability affects Bouncy Castle libraries in Java before specific versions. Detection involves checking installed library versions. For Java applications, inspect dependency files like pom.xml (Maven) or build.gradle (Gradle) for Bouncy Castle dependencies. Use commands like 'mvn dependency:tree' or 'gradle dependencies' to list versions. If using BC-FJA, check version files or JAR manifests for 'bc-fips' versions below 1.0.2.7, 2.0.2, or 2.1.3.

Impact Analysis

The vulnerability may cause a denial-of-service condition, disrupting services that rely on Bouncy Castle for cryptographic operations. Systems using affected versions could experience crashes or degraded performance during PKCS#12 operations.

Compliance Impact

The vulnerability in Bouncy Castle for Java could potentially impact compliance with GDPR and HIPAA by exposing systems to denial-of-service (DoS) attacks due to weak MAC and bag-decryption KDF iteration-count bounds. This may lead to service disruptions or unauthorized access, which are critical risks under these regulations.

Mitigation Strategies

Update Bouncy Castle for Java to version 1.85 or later, Bouncy Castle LTS to 2.73.12 or later, or BC-FJA to the specified patched versions (1.0.2.7, 2.0.2, or 2.1.3) to address the PKCS#12 MAC and bag-decryption KDF iteration-count bound vulnerability.

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