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CVE-2025-46551— JRuby-OpenSSL has hostname verification disabled by default

Quick assessment

Affected
jruby jruby-openssl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JRuby-OpenSSL是JRuby团队的一个JRuby的附加gem。 JRuby-OpenSSL 0.12.1至0.15.4之前版本存在安全漏洞，该漏洞源于证书主机名验证不足，可能导致中间人攻击。

AI Predicted 5.9 Difficulty: Easy EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2025-46551

Vulnerability Information
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Vulnerability Title
JRuby-OpenSSL has hostname verification disabled by default
Source: CVE Program / CVE List V5
Vulnerability Description
JRuby-OpenSSL is an add-on gem for JRuby that emulates the Ruby OpenSSL native library. Starting in JRuby-OpenSSL version 0.12.1 and prior to version 0.15.4 (corresponding to JRuby versions starting in 9.3.4.0 prior to 9.4.12.1 and 10.0.0.0 prior to 10.0.0.1), when verifying SSL certificates, JRuby-OpenSSL does not verify that the hostname presented in the certificate matches the one the user tries to connect to. This means a man-in-the-middle could just present any valid cert for a completely different domain they own, and JRuby would accept the cert. Anybody using JRuby to make requests of external APIs, or scraping the web, that depends on https to connect securely. JRuby-OpenSSL version 0.15.4 contains a fix for the issue. This fix is included in JRuby versions 10.0.0.1 and 9.4.12.1.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
JRuby-OpenSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JRuby-OpenSSL是JRuby团队的一个JRuby的附加gem。 JRuby-OpenSSL 0.12.1至0.15.4之前版本存在安全漏洞，该漏洞源于证书主机名验证不足，可能导致中间人攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jruby jruby-openssl >= 0.12.1, < 0.15.4 -

II. Public POCs for CVE-2025-46551

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III. Intelligence Information for CVE-2025-46551

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IV. Related Vulnerabilities

Same weakness: CWE-295