CVE-2026-59642 Details
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).
A vulnerability exists in Bouncy Castle for Java versions prior to 1.85, as well as in Bouncy Castle for Java LTS versions prior to 2.73.12 and in Bouncy Castle for Java FIPS (BC-FJA) versions prior to bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series). The issue arises in the CMS AuthenticatedData component, where the content is not properly bound to the Message Authentication Code (MAC) when authenticated attributes are present. This lack of binding could allow an attacker to manipulate the content without detection.
Users can upgrade to Bouncy Castle for Java version 1.85 or later, or to Bouncy Castle for Java LTS version 2.73.12 or later. For Bouncy Castle for Java FIPS, versions 1.0.12, 2.0.12 and 2.1.12 should be used.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/bcgit/bc-java/commit/2117f316a5a47308f3e569695a6592b16aac0dd7 | bcorg | Patch |
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059642 | bcorg | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-354 | Improper Validation of Integrity Check Value | bcorg |
Affected Products
| Product | Versions |
|---|---|
| bouncycastle bc-java | < 1.85 |
CPE
Remediation
| |
| bouncycastle bcpkix-fips | < 1.0.12 >= 2.0.7, < 2.0.12 >= 2.1.8, < 2.1.12 |
CPE
Remediation
| |
| bouncycastle bouncy castle for java lts | <= 2.73.11 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 28, 2026 | Initial Analysis | [email protected] |
| Aug 3, 2026 | CVE Modified | CISA-ADP |
| Aug 3, 2026 | CVE Modified | bcorg |
| Aug 3, 2026 | New CVE Received | bcorg |