{"id":"CVE-2021-46823","aliases":["GHSA-qfr5-wjpw-q4c4","GHSA-r8wq-qrxc-hmcm","PYSEC-2026-912"],"title":"Denial of Service in python-ldap","summary":"Denial of Service in python-ldap","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"python-ldap","product":"python-ldap","ecosystem":"pip","affected":["python-ldap < 3.4.0"],"patched":["python-ldap 3.4.0"],"published":"2022-06-19","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-qfr5-wjpw-q4c4","references":[{"url":"https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-46823"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/221507"},{"url":"https://github.com/python-ldap/python-ldap"}],"tags":["osv","pip"],"epss":0.01897,"epssPercentile":0.78759,"ingestedAt":"2026-07-08T18:25:52.408Z","slug":"CVE-2021-46823","body":"## Overview\n\npython-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.\n\n## Affected packages\n\n- `python-ldap < 3.4.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `python-ldap 3.4.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}