OpenLDAP 2.4.57 Release (2021/01/18)
Fixed ldapexop to use correct return code (ITS#9417)
Fixed slapd to remove asserts in UUIDNormalize (ITS#9391)
Fixed slapd to remove assert in csnValidate (ITS#9410)
Fixed slapd validity checks for issuerAndThisUpdateCheck (ITS#9411, ITS#9427)
Fixed slapd validity checks for serialNumberAndIssuerCheck (ITS#9404, ITS#9424)
Fixed slapd AVA sort with invalid RDN (ITS#9412)
Fixed slapd ldap_X509dn2bv to check for invalid BER after RDN count (ITS#9423, ITS#9425)
Fixed slapd saslauthz to remove asserts in validation (ITS#9406, ITS#9407)
Fixed slapd saslauthz to use slap_sl_free on normalized DN (ITS#9409)
Fixed slapd saslauthz SEGV in slap_parse_user (ITS#9413)
Fixed slapd modrdn memory leak (ITS#9420)
Fixed slapd double-free in vrfilter (ITS#9408)
Fixed slapd cancel operation to correctly terminate (ITS#9428)
Fixed slapd-ldap fix binds on retry with closed connection (ITS#9400)
Fixed slapo-syncprov to ignore duplicate sessionlog entries (ITS#9394)Source: https://www.openldap.org/software/release/changes.html