CVE-2026-59825 json
Mastodon: Unwanted deactivation of SSL/TLS certificate verification
published 2026-08-18 2 mo ago modified 2026-09-16 54 d ago also BIT-mastodon-2026-59825 , EUVD-2026-60953 , GHSA-3rhr-8phh-jm86
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 31%
- public exploits
- 0
- none known
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 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.
Patch / fix
- bitnami mastodon 4.4.19, 4.5.12
- joinmastodon mastodon 4.4.19, 4.5.12
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| OSV | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mastodon | <4.4.19 >=4.5.0, <4.5.12 |
4.4.19 4.5.12 |
Affected products
- mastodon mastodon
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
github.com
/mastodon/mastodon/pull/39571
web
-
github.com
/mastodon/mastodon/commit/2ccb6ef277e725d1932295690cf8ab9d3dc03149
web
-
github.com
/mastodon/mastodon/commit/5748d0b16ea09001e0933f76c7afe814e09652ef
web
-
github.com
/mastodon/mastodon/commit/761c61b42590a2fd91442fc15a0a7583e48bbea4
web
-
github.com
/mastodon/mastodon/security/advisories/GHSA-3rhr-8phh-jm86
web
-
github.com
/mastodon/mastodon/releases/tag/v4.4.19
web
-
github.com
/mastodon/mastodon/releases/tag/v4.5.12
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-59825
web
Sources
- CVE List CVE-2026-59825
- NVD CVE-2026-59825
- OSV BIT-mastodon-2026-59825
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.