CVE-2026-59825 json
Mastodon: Unwanted deactivation of SSL/TLS certificate verification
published 3mo ago modified last mo. 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
Is CVE-2026-59825 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2mo ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-11).
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, advisory
-
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
- Maintainer advisory GHSA-3rhr-8phh-jm86
Fencer Intel 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.
The maintainers of mastodon/mastodon published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.