CVE-2026-59649 Details
Description
In Bouncy Castle for Java before 1.85, OpenPGP user-attribute subpacket length bounded only by JVM max memory. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).
A denial-of-service vulnerability has been identified 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 bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series). The issue arises from the OpenPGP user-attribute subpacket length being limited only by the maximum memory of the Java Virtual Machine (JVM). This flaw allows for the creation of a user attribute subpacket header that declares a length of approximately 2 GiB, leading to a multi-gigabyte memory allocation before any actual data is read. This vulnerability can cause memory exhaustion, creating a denial-of-service condition for consumers importing untrusted OpenPGP certificates.
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, users should upgrade to bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) or 2.1.13 (2.1.X series).
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/a43c40dc12c3e1c6cbd03c83fe30aaec4029b824 | bcorg | Patch |
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059649 | bcorg | Third Party AdvisoryPatch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-789 | Memory Allocation with Excessive Size Value | bcorg |
Affected Products
| Product | Versions |
|---|---|
| bouncycastle bc-java | < 1.85 |
CPE
Remediation
| |
| bouncycastle bcpg-fips | < 1.0.13 >= 2.0.8, < 2.0.13 >= 2.1.10, < 2.1.13 |
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 |