CVE-2026-42568: Yamcs core Yamcs Vulnerable To LDAP Injection Vulnerability
MODERATECVE-2026-42568 is a MODERATE (CVSS 4.3) yamcs vulnerable to ldap injection vulnerability (CWE-90: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')) affecting Yamcs core libraries in the Maven ecosystem. The issue involves yamcs vulnerable to ldap injection in ldapauthmodule. Remediation is available by upgrading affected packages to version 5.12.7.
CVE-2026-42568 at a Glance
Security Impact
CVSS: 4.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2026-42568
To remediate this vulnerability, upgrade all affected Yamcs core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.yamcs</groupId>
<artifactId>yamcs-core</artifactId>
<version>5.12.7</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.yamcsHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-42568, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.yamcsAnalyze the terminal output to locate any version of Yamcs core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.12.7), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.yamcs command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-90: Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection'), where the product constructs all or part of an ldap query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended ldap query when it is sent to a downstream component. In Yamcs core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-42568 Affected Yamcs core Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.yamcs:yamcs-core
|
Maven |
< 5.12.7
|
5.12.7
|
References
Frequently Asked Questions
What is CVE-2026-42568?
Which Yamcs core versions are affected?
What version fixes CVE-2026-42568?
Is yamcs-core affected?
What is the CVSS score of CVE-2026-42568?
What CWE is associated with CVE-2026-42568?
How can I check Maven dependencies for CVE-2026-42568?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-cqh3-jg8p-336j",
"modified" : "2026-06-11T14:05:22Z",
"published" : "2026-05-26T23:39:55Z",
"aliases" : [ "CVE-2026-42568" ],
"summary" : "Yamcs Vulnerable to LDAP Injection in LdapAuthModule",
"details" : "### Summary\n\nAn LDAP injection vulnerability exists in `org.yamcs.security.LdapAuthModule` when constructing search filters. The username parameter is inserted directly into the LDAP filter without proper RFC 4515 escaping.\n\n### Root Cause\n\n**File:** `yamcs-core/src/main/java/org/yamcs/security/LdapAuthModule.java:233`\n\nThe `username` parameter is inserted directly into an LDAP search filter without RFC 4515 escaping:\n\n```java\n// VULNERABLE\nvar filter = userFilter.replace(\"{0}\", username);\nvar searchResult = getSingleResult(ctx, userBase, filter, controls);\n```\n\nLDAP wildcard characters (`*`, `(`, `)`) are accepted without sanitization.\n\n### Impact\n\nWith a known valid password, `username=*` authenticates as the first user returned by the LDAP search — enabling horizontal privilege escalation between accounts sharing similar passwords or when the attacker knows one valid password.\n\nThis affects deployments that use `org.yamcs.security.LdapAuthModule` in their `etc/security.yaml` configuration file.\n\n### Proof of Concept\n\n```bash\ncurl -X POST \"http://TARGET:8090/auth/token\" \\\n -d \"grant_type=password&username=*&password=known_password\"\n# Returns token for first matching LDAP user\n```\n\n### Fix\n\nApply RFC 4515 escaping before filter construction:\n\n```java\nprivate static String escapeLdapFilter(String input) {\n return input\n .replace(\"\\\\\", \"\\\\5c\")\n .replace(\"*\", \"\\\\2a\")\n .replace(\"(\", \"\\\\28\")\n .replace(\")\", \"\\\\29\")\n .replace(\"\\0\", \"\\\\00\");\n}\nvar filter = userFilter.replace(\"{0}\", escapeLdapFilter(username));\n```",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.yamcs:yamcs-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "5.12.7"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/yamcs/yamcs/security/advisories/GHSA-cqh3-jg8p-336j"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42568"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/yamcs/yamcs"
}, {
"type" : "WEB",
"url" : "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7"
}, {
"type" : "WEB",
"url" : "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-90" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-05-26T23:39:55Z",
"nvd_published_at" : "2026-06-10T23:16:46Z"
}
}