Vulnerabilities CVE-2026-59825

CVE-2026-59825

High

Open

TLP:CLEAR

Mastodon: Unwanted deactivation of SSL/TLS certificate verification

NVD CVE.org

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Description

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.

Details

CVSS Score: 7.4
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Confidence: 90%
Published: Aug 18, 2026
Last Modified: Aug 18, 2026

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