Summary
Fabric CA Developer's Guide: LDAP Injection via Unescaped Username in GetUser Filter
When fabric-ca is configured with an LDAP backend, the username from HTTP Basic authentication is included in an LDAP uid search filter without proper escaping. An unauthenticated attacker with network access to the CA enrollment endpoint could exploit this to perform LDAP injection before password validation, and potentially steer authentication attempts toward a victim account.
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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See it in your environmentNew to Kodem? Get a demo →Remediation advice
- All users of fabric-ca with an LDAP backend should update to a fixed version.
- For users not using an LDAP backend, no action is required.
Frequently Asked Questions
- What is CVE-2026-53658? CVE-2026-53658 is a medium-severity security vulnerability in github.com/hyperledger/fabric-ca (go), affecting versions <= 1.5.20. It is fixed in 1.5.21.
- Which versions of github.com/hyperledger/fabric-ca are affected by CVE-2026-53658? github.com/hyperledger/fabric-ca (go) versions <= 1.5.20 is affected.
- Is there a fix for CVE-2026-53658? Yes. CVE-2026-53658 is fixed in 1.5.21. Upgrade to this version or later.
- Is CVE-2026-53658 exploitable, and should I be worried? Whether CVE-2026-53658 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-53658 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-53658? Upgrade
github.com/hyperledger/fabric-cato 1.5.21 or later.