CVE-2026-59648 Details
Description
In Bouncy Castle for Java before 1.85, OpenPGP Argon2 S2K honours attacker-chosen memory and passes. 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 vulnerability exists in Bouncy Castle for Java versions prior to 1.85, as well as in the LTS version prior to 2.73.12 and in the FIPS versions BC-FJA 1.0.13, 2.0.13 and 2.1.13. The issue arises because the OpenPGP Argon2 S2K (String-to-Key) mechanism accepts and honors memory, pass, and parallelism parameters chosen by an attacker. This could potentially lead to excessive memory usage or CPU workload, as the Argon2 key derivation process is memory-intensive and can be manipulated to cause large allocations or unbounded processing times.
Users can update to Bouncy Castle for Java version 1.85 or later, or to version 2.73.12 or later in the LTS branch. For the FIPS versions, update to BC-FJA 1.0.13, 2.0.13 or 2.1.13.
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/c915cc3f7a8d58f5ea2f88f01dfef2d402dd0799 | bcorg | Patch |
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059648 | bcorg | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | bcorg |
Affected Products
| Product | Versions |
|---|---|
| bouncycastle bc-java | < 1.85 |
CPE
Remediation
| |
| bouncycastle bcpg-fips | >= 1.0.6, < 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 |
|---|---|---|
| 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 |