CVE-2025-46551

Public Exploit
JRuby-OpenSSL has hostname verification disabled by default

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.

Category

5.7
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.03%
Affected: jruby jruby-openssl
Published at:
Updated at:

References

Link Tags
https://github.com/jruby/jruby-openssl/security/advisories/GHSA-72qj-48g4-5xgx
https://github.com/jruby/jruby-openssl/commit/31a56d690ce9b8af47af09aaaf809081949ed285

Frequently Asked Questions

What is the severity of CVE-2025-46551?
CVE-2025-46551 has been scored as a medium severity vulnerability.
How to fix CVE-2025-46551?
To fix CVE-2025-46551, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-46551 being actively exploited in the wild?
It is possible that CVE-2025-46551 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-46551?
CVE-2025-46551 affects jruby jruby-openssl.
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