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Java CVE-2026-0636

| EUVDEUVD-2026-22849 MEDIUM
LDAP Injection (CWE-90)
2026-04-15 bcorg GHSA-c3fc-8qff-9hwx
Java LDAP Code Injection Bc Java
5.5
CVSS 4.0 · Vendor: bcorg
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Severity by source

Vendor (bcorg) PRIMARY
5.5 MEDIUM
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:A/V:X/RE:M/U:Amber
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Red Hat
6.5 HIGH
qualitative

Primary rating from Vendor (bcorg).

CVSS VectorVendor: bcorg

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:A/V:X/RE:M/U:Amber
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
N

Lifecycle Timeline

7
Severity Changed
Apr 15, 2026 - 15:22 NVD
CRITICAL MEDIUM
CVSS changed
Apr 15, 2026 - 15:22 NVD
10.0 (CRITICAL) 5.5 (MEDIUM)
Patch released
Apr 15, 2026 - 14:30 nvd
Patch available
Analysis Generated
Apr 15, 2026 - 12:40 vuln.today
EUVD ID Assigned
Apr 15, 2026 - 09:30 euvd
EUVD-2026-22849
Analysis Generated
Apr 15, 2026 - 09:30 vuln.today
CVE Published
Apr 15, 2026 - 08:59 nvd
MEDIUM 5.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 5 maven packages depend on org.bouncycastle:bcprov-jdk14 (5 direct, 0 indirect)
  • 410 maven packages depend on org.bouncycastle:bcprov-jdk15to18 (26 direct, 384 indirect)
  • 1,368 maven packages depend on org.bouncycastle:bcprov-jdk18on (98 direct, 1,270 indirect)

Ecosystem-wide dependent count for version 1.74 and other introduced versions.

DescriptionCVE.org

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). LDAP Injection Vulnerability in LDAPStoreHelper.java

This issue affects BC-JAVA: from 1.49 before 1.84.

AnalysisAI

LDAP injection in Bouncy Castle BC-JAVA bcprov module (versions 1.49 through 1.83) allows remote unauthenticated attackers to manipulate LDAP queries via specially crafted input to LDAPStoreHelper.java, enabling complete compromise of confidentiality, integrity, and availability across security boundaries. This critical vulnerability (CVSS 10.0) affects a widely deployed cryptographic library used throughout the Java ecosystem. No active exploitation confirmed (not in CISA KEV), but the attack r

Technical ContextAI

Bouncy Castle BC-JAVA is a foundational cryptographic library for Java providing implementations of cryptographic algorithms, X.509 certificate handling, and PKI utilities. The vulnerability resides in LDAPStoreHelper.java within the provider (bcprov) module, which handles LDAP-based certificate and CRL retrieval operations. CWE-90 (LDAP Injection) occurs when user-controllable data is concatenated into LDAP query strings without proper sanitization of special LDAP metacharacters (parentheses, asterisks, null bytes, backslashes). Attackers can inject LDAP filter operators to bypass authentication checks, extract sensitive directory data, or modify query logic. The bcprov module is embedded in countless Java applications, middleware, and enterprise systems that perform certificate validation or directory operations. Affected CPE: cpe:2.3:a:legion_of_the_bouncy_castle_inc.:bc-java spanning a 35-version range (1.49 to 1.83), representing years of production deployments.

RemediationAI

Upgrade BC-JAVA bcprov module to version 1.84 or later, which contains input validation fixes for LDAP query construction in LDAPStoreHelper.java. Organizations should inventory all Java applications and dependencies to identify embedded Bouncy Castle versions using dependency scanning tools (Maven dependency tree, Gradle dependencies, or SBOM analysis). For systems where immediate upgrade is not feasible, implement compensating controls by restricting network access to LDAP directory services, validating and sanitizing all external input before passing to certificate validation routines, and disabling LDAP-based certificate retrieval features if not operationally required. Review application logs for suspicious LDAP query patterns or unexpected directory access. Consult the official vendor security advisory at https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%900636 for additional mitigation guidance and technical details. Given the 35-version span of affected releases, prioritize patching based on whether applications actively use the LDAPStoreHelper functionality rather than just including the library.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected

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CVE-2026-0636 vulnerability details – vuln.today
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