CVE-2026-59651 Details
Description
In Bouncy Castle for Java before 1.85, BKS keystore accepts legacy version with 16-bit integrity MAC key. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
A vulnerability exists in Bouncy Castle for Java versions prior to 1.85 and in the LTS version prior to 2.73.12, where the BKS keystore improperly handles legacy version 0/1 files. These older formats generate a 16-bit integrity MAC key, which is susceptible to brute-force attacks. The issue allows for the injection of a rogue trusted certificate into the keystore by exploiting the weakened integrity verification.
Users can update to Bouncy Castle for Java version 1.85 or LTS version 2.73.12 or later, where this vulnerability has been addressed.
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
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/bcgit/bc-java/commit/faf5daa6e9b8460f862afc0af1cc0da365f7d4d2 | bcorg | Patch |
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059651 | bcorg | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-326 | Inadequate Encryption Strength | bcorg |
Affected Products
| Product | Versions |
|---|---|
| bouncycastle bc-java | < 1.85 |
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 |
|---|---|---|
| Sep 2, 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 |