{"id":"CVE-2026-59825","summary":"Mastodon: Unwanted deactivation of SSL/TLS certificate verification","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.","aliases":["BIT-mastodon-2026-59825","GHSA-3rhr-8phh-jm86"],"modified":"2026-08-24T08:25:58.578087443Z","published":"2026-08-18T15:07:14.555Z","database_specific":{"cwe_ids":["CWE-295"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59825.json","cna_assigner":"GitHub_M"},"references":[{"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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59825.json"},{"type":"ADVISORY","url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-3rhr-8phh-jm86"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59825"},{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/2ccb6ef277e725d1932295690cf8ab9d3dc03149"},{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/5748d0b16ea09001e0933f76c7afe814e09652ef"},{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/761c61b42590a2fd91442fc15a0a7583e48bbea4"},{"type":"FIX","url":"https://github.com/mastodon/mastodon/pull/39571"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mastodon/mastodon","events":[{"introduced":"0"},{"introduced":"26c78392f88afccebb8a88b68bc9994a9ce12648"},{"fixed":"f3b07a5c9b2e5867070e25af87c97f026813f6f7"},{"fixed":"52a9658521eb41b6b30b7feca58f1deddc58659c"},{"fixed":"2ccb6ef277e725d1932295690cf8ab9d3dc03149"},{"fixed":"5748d0b16ea09001e0933f76c7afe814e09652ef"},{"fixed":"761c61b42590a2fd91442fc15a0a7583e48bbea4"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"4.4.19"},{"introduced":"4.5.0"},{"fixed":"4.5.12"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v4.6.0-rc.1","v4.6.0-beta.1","v4.5.11","v4.4.18","v4.4.17","v4.5.10","v4.4.16","v4.5.9","v4.4.15","v4.5.8","v4.4.14","v4.5.7","v4.5.6","v4.4.13","v4.4.12","v4.5.5","v4.5.4","v4.4.11","v4.5.3","v4.4.10","v4.5.2","v4.4.9","v4.5.1","v4.5.0","v4.4.8","v4.5.0-rc.1","v4.5.0-beta.2","v4.4.7","v4.5.0-beta.1","v4.4.6","v4.4.5","v4.4.4","v4.4.3","v4.4.2","v4.4.1","v4.4.0","v4.4.0-rc.1","v4.4.0-beta.2","v4.4.0-beta.1","v4.3.0-rc.1","v4.3.0-beta.2","v4.3.0-beta.1","v4.2.0","v4.2.0-rc2","v4.2.0-rc1","v4.2.0-beta3","v4.2.0-beta2","v4.2.0-beta1","v4.0.2","v4.1.0","v4.1.0rc3","v4.1.0rc2","v4.1.0rc1","v4.0.1","v4.0.0","v4.0.0rc4","v3.5.3","v4.0.0rc3","v4.0.0rc2","v4.0.0rc1","v3.5.2","v3.5.1","v3.5.0","v3.5.0rc3","v3.5.0rc2","v3.5.0rc1","v3.3.0","v3.4.1","v3.4.0","v3.4.0rc2","v3.4.0rc1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.2.0","v3.2.0rc2","v3.2.0rc1","v3.1.4","v3.1.3","v3.1.2","v3.0.1","v3.1.1","v3.1.0","v3.1.0rc2","v3.1.0rc1","v3.0.0","v3.0.0rc3","v3.0.0rc2","v3.0.0rc1","v2.9.2","v2.9.1","v2.9.0","v2.9.0rc2","v2.9.0rc1","v2.8.2","v2.8.1","v2.8.0","v2.8.0rc3","v2.8.0rc2","v2.8.0rc1","v2.7.1","v2.7.0","v2.7.0rc3","v2.7.0rc2","v2.7.0rc1","v2.6.1","v2.6.0","v2.6.0rc4","v2.6.0rc3","v2.6.0rc2","v2.6.0rc1","v2.5.0","v2.5.0rc2","v2.5.0rc1","v2.4.3","v2.4.3rc3","v2.4.3rc2","v2.4.3rc1","v2.4.2","v2.4.2rc3","v2.4.2rc2","v2.4.2rc1","v2.4.1","v2.4.1rc4","v2.4.1rc3","v2.4.1rc2","v2.4.1rc1","v2.4.0","v2.4.0rc5","v2.4.0rc4","v2.4.0rc3","v2.4.0rc2","v2.4.0rc1","v2.3.2","v2.3.2rc5","v2.3.2rc4","v2.3.2rc3","v2.3.2rc2","v2.3.2rc1","v2.3.1","v2.3.1rc3","v2.3.1rc2","v2.3.1rc1","v2.3.0","v2.3.0rc3","v2.3.0rc2","v2.3.0rc1","v2.2.0","v2.2.0rc2","v2.2.0rc1","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.1.0rc6","v2.1.0rc5","v2.1.0rc4","v2.1.0rc3","v2.1.0rc2","v2.1.0rc1","v2.0.0","v2.0.0rc4","v2.0.0rc3","v2.0.0rc2","v2.0.0rc1","v1.6.1","v1.6.0","v1.6.0rc5","v1.6.0rc4","v1.6.0rc3","v1.6.0rc2","v1.6.0rc1","v1.5.1","v1.5.0","v1.5.0rc3","v1.5.0rc2","v1.5.0rc1","v1.4.7","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4rc6","v1.4rc5","v1.4rc4","v1.4rc3","v1.4rc2","v1.4rc1","v1.3.2","v1.3.1","v1.3","v1.2.2","v1.2.1","v1.2","v1.1.2","v1.1.1","v1.1","v1.0","v0.9.9","v0.9","v0.8","v0.7","v0.6","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59825.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}