CVE-2026-58063 Details
Description
In Bouncy Castle for Java before 1.85, BCFKS keystore load honours unbounded KDF cost from untrusted file. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (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 before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series). The issue arises because the BCFKS keystore load process accepts unbounded key derivation function (KDF) costs from untrusted files. This flaw can lead to denial-of-service conditions by exhausting CPU resources or memory, depending on the KDF method used.
Users can update 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 update to bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) or 2.1.3 (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/81737a56ef4489da1f849cf549df95e338ea6b06 | bcorg | Patch |
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9058063 | bcorg | Third Party AdvisoryPatch |
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 bouncy castle for java lts | <= 2.73.11 |
CPE
Remediation
| |
| bouncycastle fips java api | >= 1.0.0, < 1.0.2.7 >= 2.0.0, < 2.0.2 >= 2.1.0, < 2.1.3 |
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 |