Answer in brief
CVE-2026-5588 records a High severity (CVSS 7.5) vulnerability in PKIX draft CompositeVerifier accepts empty signature sequence as valid.. The current sources do not mark it as known exploited. The current feed maps Legion of the Bouncy Castle Inc./BC-JAVA (generic), Legion of the Bouncy Castle Inc./BCPIX-LTS (generic), Legion of the Bouncy Castle Inc./BCPKIX-FIPS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-5588 records a High severity (CVSS 7.5) vulnerability in PKIX draft CompositeVerifier accepts empty signature sequence as valid.. The current sources do not mark it as known exploited. The current feed maps Legion of the Bouncy Castle Inc./BC-JAVA (generic), Legion of the Bouncy Castle Inc./BCPIX-LTS (generic), Legion of the Bouncy Castle Inc./BCPKIX-FIPS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Legion of the Bouncy Castle Inc./BC-JAVA (generic), Legion of the Bouncy Castle Inc./BCPIX-LTS (generic), Legion of the Bouncy Castle Inc./BCPKIX-FIPS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Legion of the Bouncy Castle Inc./BC-JAVAgeneric | >=1.67 <1.80.2 || >=1.81 <1.81.1 || >=1.82 <1.84 | 1.80.2, 1.81.1, 1.84 |
| Legion of the Bouncy Castle Inc./BCPIX-LTSgeneric | >=2.73.7 <2.73.11 | 2.73.11 |
| Legion of the Bouncy Castle Inc./BCPKIX-FIPSgeneric | >=2.0.6 <2.0.11 || >=2.1.7 <2.1.11 | 2.0.11, 2.1.11 |
Published upstream
Apr 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Legion of the Bouncy Castle Inc./BC-JAVA (generic), Legion of the Bouncy Castle Inc./BCPIX-LTS (generic), Legion of the Bouncy Castle Inc./BCPKIX-FIPS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Legion of the Bouncy Castle Inc./BC-JAVAgeneric | >=1.67 <1.80.2 || >=1.81 <1.81.1 || >=1.82 <1.84 | 1.80.2, 1.81.1, 1.84 |
| Legion of the Bouncy Castle Inc./BCPIX-LTSgeneric | >=2.73.7 <2.73.11 | 2.73.11 |
| Legion of the Bouncy Castle Inc./BCPKIX-FIPSgeneric | >=2.0.6 <2.0.11 || >=2.1.7 <2.1.11 | 2.0.11, 2.1.11 |
Published upstream
Apr 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java. This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.
Quoted source text, attributed separately from HOL analysis.