CVE-2026-5588— PKIX draft CompositeVerifier accepts empty signature sequence as valid.
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I. Basic Information for CVE-2026-5588
Vulnerability Information
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Vulnerability Title
PKIX draft CompositeVerifier accepts empty signature sequence as valid.
Source: NVD (National Vulnerability Database)
Vulnerability Description
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 1.84; 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: NVD (National Vulnerability Database)
Vulnerability Title
Bouncy Castle Java 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bouncy Castle Java是Legion of the Bouncy Castle Inc开源的一个加密算法程序。 Bouncy Castle Java 1.49至1.84之前版本存在安全漏洞，该漏洞源于使用有缺陷的加密算法，可能导致接受空签名序列为有效。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA | 1.67 ~ 1.84 | - | |
| Legion of the Bouncy Castle Inc. | BCPKIX-FIPS | 2.0.6 ~ 2.0.11 | - | |
| Legion of the Bouncy Castle Inc. | BCPIX-LTS | 2.73.7 ~ 2.73.11 | - |
II. Public POCs for CVE-2026-5588
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Legion of the Bouncy Castle Inc. · 2026-04-15 · 5 CVEs total
| CVE-2026-0636 | LDAP Injection Vulnerability in LDAPStoreHelper.java | |
| CVE-2026-3505 | Unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion. | |
| CVE-2026-5598 | Non-constant time comparisons risk private key leakage in FrodoKEM. | |
| CVE-2025-14813 | GOSTCTR implementation unable to process more than 255 blocks correctly |
IV. Related Vulnerabilities
Same product: BC-JAVA
Same vendor: Legion of the Bouncy Castle Inc.
- CVE-2026-8149
GCM chunking can lead to bad tag exception on decryption - CVE-2026-3505
Unbounded PGP AEAD chunk size leads to pre-auth resource exh - CVE-2026-5598
Non-constant time comparisons risk private key leakage in Fr - CVE-2026-0636
LDAP Injection Vulnerability in LDAPStoreHelper.java - CVE-2025-14813
GOSTCTR implementation unable to process more than 255 block
V. Comments for CVE-2026-5588
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