LDAP Configuration Vulnerability in Hyperledger Fabric CA
CVE-2026-53658

6.3MEDIUM

Key Information:

Vendor

Hyperledger

Status
Fabric-ca
Vendor
CVE Published:
15 September 2026

What is CVE-2026-53658?

The Fabric CA's LDAP configuration prior to version 1.5.21 has a significant flaw that enables unauthenticated attackers to manipulate LDAP user searches. When HTTP Basic authentication is configured, the system improperly incorporates usernames into its LDAP query without adequately escaping LDAP metacharacters. This could lead to malicious individuals steering authentication attempts towards legitimate user accounts, enabling unauthorized access. For organizations using the LDAP backend configuration, it is crucial to upgrade to version 1.5.21 or later to mitigate this security risk. Deployments that do not utilize an LDAP backend remain unaffected.

Affected Version(s)

fabric-ca < 1.5.21

References

https://github.com/hyperledger/fabric-ca/security/advisor...
x_refsource_CONFIRM
https://github.com/hyperledger/fabric-ca/pull/501
x_refsource_MISC
https://github.com/hyperledger/fabric-ca/commit/d379df823...
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.