{"id":"CVE-2026-59825","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-59825","summary":"Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.19 and from 4.5.0 until 4.5.12, Mastodon's app/models/concerns/user/ldap_authenticable.rb mutates…","details":"Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.19 and from 4.5.0 until 4.5.12, Mastodon's app/models/concerns/user/ldap_authenticable.rb mutates OpenSSL::SSL::SSLContext::DEFAULT_PARAMS when LDAP authentication uses LDAP_TLS_NO_VERIFY=true, disabling SSL and TLS certificate verification globally for requests made by puma web processes while sidekiq background jobs remain unaffected. This issue is fixed in versions 4.4.19 and 4.5.12.","published":"2026-08-18T15:16:55.623","modified":"2026-08-18T15:16:55.623","cvss":{"score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/mastodon/mastodon/commit/2ccb6ef277e725d1932295690cf8ab9d3dc03149","label":"mastodon/mastodon@2ccb6ef"},"references":[{"type":"WEB","url":"https://github.com/mastodon/mastodon/commit/2ccb6ef277e725d1932295690cf8ab9d3dc03149"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/commit/5748d0b16ea09001e0933f76c7afe814e09652ef"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/commit/761c61b42590a2fd91442fc15a0a7583e48bbea4"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/pull/39571"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/releases/tag/v4.4.19"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/releases/tag/v4.5.12"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-3rhr-8phh-jm86"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T15:16:55.623"}}