CVE-2026-5588
PKIX draft CompositeVerifier accepts empty signature sequence as valid.
Description
: Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules). PKIX draft CompositeVerifier accepts empty signature sequence as valid. This issue affects BC-JAVA: from 1.49 before 1.84.
INFO
Published Date :
April 15, 2026, 9:06 a.m.
Last Modified :
April 15, 2026, 9:06 a.m.
Remotely Exploit :
Yes !
Source :
bcorg
Affected Products
The following products are affected by CVE-2026-5588
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | 91579145-5d7b-4cc5-b925-a0262ff19630 |
Solution
- Update BC-JAVA library to version 1.84 or later.
- Verify cryptographic validation logic.
- Apply vendor-provided patches if available.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-5588 vulnerability anywhere in the article.