CVE-2009-4123
jruby-openssl gem for JRuby fails to do proper certificate validation
The jruby-openssl gem before 0.6 for JRuby mishandles SSL certificate validation.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
The jruby-openssl gem before 0.6 for JRuby mishandles SSL certificate validation.
- Record
CVE-2009-4123- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
CVE List No score
The jruby-openssl gem before 0.6 for JRuby mishandles SSL certificate validation.
- Record
CVE-2009-4123- Updated
- 2026-11-02
EUVDEUVD-2023-0588 No score
The jruby-openssl gem before 0.6 for JRuby mishandles SSL certificate validation.
- Record
EUVD-2023-0588- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xgv7-pqqh-h2w9
jruby-openssl gem for JRuby fails to do proper certificate validation
A security problem involving peer certificate verification was found where failed verification silently did nothing, making affected applications vulnerable to attackers. Attackers could lead a client application to believe that a secure connection to a rogue SSL server is legitimate. Attackers could also penetrate client-validated SSL server applications with a dummy certificate.
- Record
GHSA-xgv7-pqqh-h2w9- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
OSVGHSA-xgv7-pqqh-h2w9
jruby-openssl gem for JRuby fails to do proper certificate validation
A security problem involving peer certificate verification was found where failed verification silently did nothing, making affected applications vulnerable to attackers. Attackers could lead a client application to believe that a secure connection to a rogue SSL server is legitimate. Attackers could also penetrate client-validated SSL server applications with a dummy certificate.
- Record
GHSA-xgv7-pqqh-h2w9- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
jruby-opensslRubyGems |
before 0.6 | 0.6 |
jruby-opensslRubyGems |
before 0.6, plus listed versions 0.0.10.0.20.0.30.0.40.1 Show 10 moreShow less0.1.10.20.2.10.2.20.2.30.30.40.50.5.10.5.2 |
0.6 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-4123 is a high vulnerability (CVSS 7.5) in Jruby Jruby-openssl, published January 19, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.60%, the 48th percentile. Fixed in jruby-openssl 0.6.
References
github.com/advisories/GHSA-xgv7-pqqh-h2w9
jruby.org/2009/12/07/vulnerability-in-jruby-openssl
web.archive.org/web/20101213091125/http://jruby.org/2009/12/07/vulnerability-in-jruby-openssl
nvd.nist.gov/vuln/detail/CVE-2009-4123