{"cve":"CVE-2021-46823","nvd":{"published":"2022-06-18T16:15:08.173","modified":"2026-06-17T04:15:37.160","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-1333"],"references":["https://exchange.xforce.ibmcloud.com/vulnerabilities/221507","https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm","https://exchange.xforce.ibmcloud.com/vulnerabilities/221507","https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm"],"products":["python-ldap:python-ldap"],"source":"nvd","synced_at":"2026-10-19T21:32:39.174919249+00:00"},"epss":{"cve":"CVE-2021-46823","score":0.01943,"percentile":0.80152,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-qfr5-wjpw-q4c4","url":"https://osv.dev/vulnerability/GHSA-qfr5-wjpw-q4c4","summary":"Denial of Service in python-ldap","modified":"2026-07-08T06:49:50.975651370Z","packages":[{"ecosystem":"PyPI","name":"python-ldap","purl":"pkg:pypi/python-ldap","ranges":["<3.4.0"],"fixed":["3.4.0"]}]},{"id":"GHSA-r8wq-qrxc-hmcm","url":"https://osv.dev/vulnerability/GHSA-r8wq-qrxc-hmcm","summary":"ReDoS in LDAP schema parser","modified":"2026-07-08T06:49:50.975651370Z","packages":[{"ecosystem":"PyPI","name":"python-ldap","purl":"pkg:pypi/python-ldap","ranges":["<3.4.0"],"fixed":["3.4.0"]}]},{"id":"PYSEC-2026-912","url":"https://osv.dev/vulnerability/PYSEC-2026-912","summary":"Denial of Service in python-ldap","modified":"2026-07-08T06:49:50.975651370Z","packages":[{"ecosystem":"PyPI","name":"python-ldap","purl":"pkg:pypi/python-ldap","ranges":["<3.4.0"],"fixed":["3.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}