{"id":"CVE-2026-59825","title":"Mastodon is a free, open-source social network server based on ActivityPub","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 OpenSSL::SSL::SSLContext::DEFAULT_PARAMS when LDAP…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-295"],"published":"2026-08-18","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:44.293","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59825","references":[{"url":"https://github.com/mastodon/mastodon/commit/2ccb6ef277e725d1932295690cf8ab9d3dc03149","label":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/commit/5748d0b16ea09001e0933f76c7afe814e09652ef","label":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/commit/761c61b42590a2fd91442fc15a0a7583e48bbea4","label":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/pull/39571","label":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.4.19","label":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.5.12","label":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-3rhr-8phh-jm86","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00347,"epssPercentile":0.28433,"ingestedAt":"2026-09-16T13:56:12.591Z","slug":"CVE-2026-59825","body":"## Overview\n\nMastodon 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}