PostgreSQL JDBC Driver Vulnerability in libpgjava: Channel Binding Misconfiguration
Summary
CVE-2025-49146: pgjdbc is an open source postgresql JDBC Driver. Affects libpgjava across 2 version ranges.
< 42.7.7-1
< 9217ed16cb2918ab1b6b9258ae97e6ede244d8a0
Fixed in 42.7.7-1. How to fix ↓
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Background
libpgjava is the PostgreSQL JDBC Driver used for connecting Java applications to PostgreSQL databases. It supports various authentication methods and is widely utilized in Java applications for database interactions. The driver is designed to ensure secure connections, but a recent vulnerability has been identified that affects its channel binding configuration.
Vulnerability Detail
The vulnerability, identified as CVE-2025-49146, arises from a misconfiguration in the PostgreSQL JDBC driver when channel binding is set to 'required'. This setting is intended to enhance security by ensuring that only authentication methods supporting channel binding can be used. However, between versions 42.7.4 and 42.7.7, the driver erroneously allowed connections using authentication methods that do not support channel binding, such as password, MD5, GSS, or SSPI. This flaw could enable a man-in-the-middle attacker to intercept connections that users believed were secured by channel binding, potentially compromising sensitive data.
How To Fix
Minimum fixed version
42.7.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libpgjavaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider configuring the PostgreSQL JDBC driver to use channel binding set to 'prefer' instead of 'required'. This can be done by modifying the connection string in your application to include the parameter 'channelBinding=prefer'.
Conclusion
The CVE-2025-49146 vulnerability in the PostgreSQL JDBC driver (libpgjava) highlights the importance of proper channel binding configuration. By updating to version 42.7.7 or later, users can secure their applications against potential man-in-the-middle attacks. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
Channel binding is a security feature that ensures the integrity of the connection between a client and a server, preventing man-in-the-middle attacks.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to address this vulnerability could expose your application to man-in-the-middle attacks, leading to potential data breaches and unauthorized access to sensitive information.
Yes, version 42.7.7 and later of libpgjava has fixed the vulnerability and is safe to use.
If an immediate update is not possible, consider using the workaround of setting channel binding to 'prefer' to mitigate the risk until you can perform the update.
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