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CVE-2026-0636— LDAP Injection Vulnerability in LDAPStoreHelper.java

Quick assessment

Affected
Legion of the Bouncy Castle Inc. BC-JAVA
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Bouncy Castle Java是Legion of the Bouncy Castle Inc开源的一个加密算法程序。 Bouncy Castle Java 1.84之前版本存在安全漏洞，该漏洞源于LDAP查询中特殊元素中和不当，可能导致LDAP注入攻击。

CVSS 5.5 · Medium EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
Legion of the Bouncy Castle Inc. BC-JAVA 1.74< 1.80.2 affected
1.81< 1.81.1 affected
1.82< 1.84 affected
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I. Basic Information for CVE-2026-0636

Vulnerability Information
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Vulnerability Title
LDAP Injection Vulnerability in LDAPStoreHelper.java
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of special elements used in an LDAP query ('LDAP injection') vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcprov on all (prov modules). This vulnerability is associated with program files LDAPStoreHelper. This issue affects BC-JAVA: from 1.74 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/S:N/AU:Y/R:A/RE:M/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
Source: CVE Program / CVE List V5
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 1.84之前版本存在安全漏洞，该漏洞源于LDAP查询中特殊元素中和不当，可能导致LDAP注入攻击。
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 1.74 ~ 1.80.2 -

II. Public POCs for CVE-2026-0636

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III. Intelligence Information for CVE-2026-0636

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Patches & Fixes for CVE-2026-0636 (1)

Same Patch Batch · Legion of the Bouncy Castle Inc. · 2026-04-15 · 5 CVEs total

CVE-2025-14813 9.3 CRITICAL GOSTCTR implementation unable to process more than 255 blocks correctly
CVE-2026-5598 8.9 HIGH Non-constant time comparisons risk private key leakage in FrodoKEM.
CVE-2026-3505 8.7 HIGH Unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion.
CVE-2026-5588 6.3 MEDIUM PKIX draft CompositeVerifier accepts empty signature sequence as valid.

IV. Related Vulnerabilities

Same product: BC-JAVA
Same vendor: Legion of the Bouncy Castle Inc.
Same weakness: CWE-90

V. Comments for CVE-2026-0636

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