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Unwanted deactivation of SSL/TLS certificate verification

High
ClearlyClaire published GHSA-3rhr-8phh-jm86 Jul 16, 2026

Package

mastodon

Affected versions

<= 4.4.18, <= 4.5.11

Patched versions

4.4.19, 4.5.12

Description

Summary

Deactivating certificate validation for LDAP authentication also deactivates the validation for other use cases.

Impact

This issue only impacts servers running Mastodon versions < 4.6 that use LDAP authentication and set the environment variable LDAP_TLS_NO_VERIFY to true.

On these servers, certificate validation is disabled globally, so all requests made from web processes (puma) will not verify SSL certificates. Background jobs (sidekiq) are not affected.

Patches

This issue has been fixed in version 4.4.19 and 4.5.12 respectively.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVE ID

CVE-2026-59825

Weaknesses

No CWEs