python-ldap before 3.4.0 is vulnerable to a denial of service when ldap.schema is used for untrusted schema definitions, because of a regular expression denial of service (ReDoS) flaw in the LDAP schema parser. By sending crafted regex input, a remote authenticated attacker could exploit this vulnerability to cause a denial of service condition. CREATE(Triage):(User=admin) CVE-2021-46823 (https://nvd.nist.gov/vuln/detail/CVE-2021-46823)
