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VULNERABILITIES

CVE-2026-59639 Details

Description

In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. 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).

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/bcgit/bc-java/commit/99ddc6dcc6782e6a76b0dd587c77e62eb7096ad0 bcorgPatch
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059639 bcorgThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-347Improper Verification of Cryptographic Signaturebcorg

Affected Products

ProductVersions
bouncycastle bc-java
< 1.85

CPE

  • cpe:2.3:a:bouncycastle:bc-java:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
bouncycastle bcpkix-fips
< 1.0.12
>= 2.0.7, < 2.0.12
>= 2.1.8, < 2.1.12

CPE

  • cpe:2.3:a:bouncycastle:bcpkix-fips:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
bouncycastle bouncy castle for java lts
<= 2.73.11

CPE

  • cpe:2.3:a:bouncycastle:bouncy_castle_for_java_lts:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-59639
NVD Published Date:
Aug 3, 2026
NVD Last Modified:
Aug 28, 2026
Source:
bcorg
CVE-2026-59639 Details - Not Deferred