JRuby-OpenSSL has hostname verification disabled by default
Summary
When verifying SSL certificates, jruby-openssl is not verifying that the hostname presented in the certificate matches the one we are trying to connect to, meaning a MITM could just present any valid cert for a completely different domain they own, and JRuby wouldn't complain.
Details
n/a
PoC
An example domain bad.substitutealert.com was created to present the a certificate for the domain s8a.me. The following script run in IRB in CRuby 3.4.3 will fail with certificate verify failed (hostname mismatch), but will work just fine in JRuby 10.0.0.0 and JRuby 9.4.2.0, both of which use jruby-openssl version 0.15.3
require "net/http"
require "openssl"
uri = URI("https://bad.substitutealert.com/")
https = Net::HTTP.new(uri.host, uri.port)
https.use_ssl = true
https.verify_mode = OpenSSL::SSL::VERIFY_PEER
body = https.start { https.get(uri.request_uri).body }
puts bodyImpact
Anybody using JRuby to make requests of external APIs, or scraping the web, that depends on https to connect securely
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Java / Kotlin (Maven) | org.jruby:jruby | >= 10.0.0.0, < 10.0.0.1, >= 9.3.4.0, < 9.4.12.1 | 10.0.0.1, 9.4.12.1 |
| Java / Kotlin (Maven) | rubygems:jruby-openssl | >= 0.12.1, < 0.15.4 | 0.15.4 |
Referencias
- https://github.com/jruby/jruby-openssl/security/advisories/GHSA-72qj-48g4-5xgx
- https://nvd.nist.gov/vuln/detail/CVE-2025-46551
- https://github.com/jruby/jruby-openssl/commit/31a56d690ce9b8af47af09aaaf809081949ed285
- https://github.com/jruby/jruby-openssl/commit/b1fc5d645c0d90891b8865925ac1c15e3f15a055
- https://github.com/jruby/jruby-openssl
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/jruby-openssl/CVE-2025-46551.yml
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P- Debilidad (CWE)
CWE-295, CWE-297- Plataforma
- Java / Kotlin (Maven)
- Paquete
org.jruby:jruby, rubygems:jruby-openssl- Publicada
- 07.05.2025
- Actualizado
- 11.10.2026 13:20
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-72qj-48g4-5xgx - CC BY 4.0
Historial de vulnerabilidades: org.jruby:jruby
Todas las vulnerabilidades publicadas de este paquete (Java / Kotlin (Maven)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 05.2022 05.2025
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Media 2
Divulgaciones por año
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 0
-
JRuby-OpenSSL has hostname verification disabled by default esta entrada
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