CVE-2026-59642
Received Received - Intake

CMS AuthenticatedData Content Not Bound to MAC 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, CMS AuthenticatedData content not bound to MAC when authAttrs present. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (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-2026-59642
EUVD
EUVD-2026-52032

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
bouncy_castle bouncy_castle_for_java to 1.85 (exc)
bouncy_castle bouncy_castle_for_java_lts to 2.73.12 (exc)
bouncy_castle bouncy_castle_for_java_fips to 1.0.12 (exc)
bouncy_castle bouncy_castle_for_java_fips to 2.0.12 (exc)
bouncy_castle bouncy_castle_for_java_fips to 2.1.12 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-354 The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This may prevent it from detecting if the data has been modified or corrupted in transmission.

Attack-Flow Graph

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Executive Summary

In Bouncy Castle for Java before version 1.85, there is a vulnerability where CMS AuthenticatedData content is not properly bound to the Message Authentication Code (MAC) when authentication attributes are present. This flaw affects multiple versions of Bouncy Castle, including the LTS and FIPS variants.

Impact Analysis

This vulnerability could allow an attacker to tamper with authenticated data without detection, potentially leading to unauthorized access or data manipulation. The high impact on integrity (VI:H) suggests serious risks to data trustworthiness.

Compliance Impact

This vulnerability may violate compliance requirements that mandate data integrity and authenticity, such as GDPR's integrity principle or HIPAA's security rule for protecting health information. Non-compliance could result in legal penalties.

Mitigation Strategies

Upgrade Bouncy Castle for Java to version 1.85 or later. For LTS versions, upgrade to 2.73.12 or later. For BC-FJA, upgrade to bcpkix-fips 1.0.12, 2.0.12, or 2.1.12 depending on your series.

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