Security Flaw in libpq: Integer Wraparound Vulnerability
Summary
ALSA-2026:0458: Moderate: libpq security update. Affects libpq versions < 13.23-1.el9_7. Fixed in 13.23-1.el9_7. How to fix ↓
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Background
The libpq package is the PostgreSQL client library that enables client applications to connect to PostgreSQL database servers. It is a crucial component for applications that rely on PostgreSQL for data storage and retrieval. The library is widely used due to its robust features and support for various programming languages. However, it has been identified to have a security vulnerability that could potentially compromise the integrity of applications utilizing it.
Vulnerability Detail
The vulnerability stems from an integer wraparound issue in the libpq package, specifically identified as CVE-2025-12818. This flaw allows for undersized memory allocations, which could lead to buffer overflows or other unexpected behaviors. If exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial of service, impacting the availability and security of applications that depend on this library.
How To Fix
Minimum fixed version
13.23-1.el9_7
This is the first release that contains the fix.
sudo dnf update libpqTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users may consider limiting access to applications that utilize the vulnerable libpq library until the update can be applied. Additionally, monitoring for unusual behavior in applications that rely on this library may help mitigate potential risks.
Conclusion
In summary, the libpq package has a moderate security vulnerability identified as CVE-2025-12818, which can lead to serious implications if not addressed. Users are strongly encouraged to update to the latest patched version to safeguard their applications. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2025-12818 is the identifier for a security vulnerability in the libpq package that involves integer wraparound leading to undersized memory allocations.
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 lead to potential exploitation, including arbitrary code execution or denial of service, impacting application security and availability.
Yes, you should upgrade to version 13.23-1.el9_7 or later to ensure that the vulnerability is patched.
The libpq package serves as the PostgreSQL client library, allowing client applications to connect and interact with PostgreSQL database servers.
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