{"cve":"CVE-2026-40193","nvd":{"published":"2026-04-16T00:16:28.163","modified":"2026-10-26T21:10:00.170","status":"Analyzed","description":"maddy is a composable, all-in-one mail server. Versions prior to 0.9.3 contain an LDAP injection vulnerability in the auth.ldap module where user-supplied usernames are interpolated into LDAP search filters and DN strings via strings.ReplaceAll() without any LDAP filter escaping, despite the go-ldap/ldap/v3 library's ldap.EscapeFilter() function being available in the same import. This affects three code paths: the Lookup() filter, the AuthPlain() DN template, and the AuthPlain() filter. An attacker with network access to the SMTP submission or IMAP interface can inject arbitrary LDAP filter expressions through the username field in AUTH PLAIN or LOGIN commands. This enables identity spoofing by manipulating filter results to authenticate as another user, LDAP directory enumeration via wildcard filters, and blind extraction of LDAP attribute values using authentication responses as a boolean oracle or via timing side-channels between the two distinct failure paths. This issue has been fixed in version 0.9.3.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2},"cwes":["CWE-90"],"references":["https://github.com/foxcpp/maddy/commit/6a06337eb41fa87a35697366bcb71c3c962c44ba","https://github.com/foxcpp/maddy/releases/tag/v0.9.3","https://github.com/foxcpp/maddy/security/advisories/GHSA-5835-4gvc-32pc"],"products":["maddy_project:maddy"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-40193","score":0.00419,"percentile":0.35964,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-5835-4gvc-32pc","url":"https://osv.dev/vulnerability/GHSA-5835-4gvc-32pc","summary":"Maddy Mail Server has an LDAP Filter Injection via Unsanitized Username","modified":"2026-06-25T18:56:34.622099974Z","packages":[{"ecosystem":"Go","name":"github.com/foxcpp/maddy","purl":"pkg:golang/github.com/foxcpp/maddy","ranges":["<0.9.3"],"fixed":["0.9.3"]}]},{"id":"GO-2026-5137","url":"https://osv.dev/vulnerability/GO-2026-5137","summary":"Maddy Mail Server has an LDAP Filter Injection via Unsanitized Username in github.com/foxcpp/maddy","modified":"2026-06-25T18:45:26.699235127Z","packages":[{"ecosystem":"Go","name":"github.com/foxcpp/maddy","purl":"pkg:golang/github.com/foxcpp/maddy","ranges":["<0.9.3"],"fixed":["0.9.3"]}]}],"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."]}