Critical Out-of-Bounds Vulnerability in libpcap Package
Summary
ALSA-2026:74441: Important: libpcap security update. Affects libpcap versions < 14:1.10.0-4.el9_8.1. Fixed in 14:1.10.0-4.el9_8.1. How to fix ↓
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Background
libpcap is a widely-used library that provides a portable framework for low-level network monitoring. It is essential for collecting network statistics, conducting security monitoring, and debugging network issues. This library is crucial for applications that require packet capturing and analysis, making it a key component in network management and security tools.
Vulnerability Detail
The libpcap package has been identified to contain an out-of-bounds read and write vulnerability, which allows for arbitrary memory access. This vulnerability, cataloged as CVE-2026-0799, can lead to potential exploitation by attackers, allowing them to manipulate memory in a way that could compromise system integrity or lead to unauthorized data access. The vulnerability arises from improper handling of memory boundaries within the library's code, making it critical for users to address this issue promptly.
How To Fix
Minimum fixed version
14:1.10.0-4.el9_8.1
This is the first release that contains the fix.
sudo dnf update libpcapTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can limit the use of the libpcap library in applications that are vulnerable until the update can be applied. Additionally, restricting access to network interfaces monitored by libpcap can help mitigate potential exploitation.
Conclusion
The libpcap security update addresses a critical out-of-bounds vulnerability that can lead to arbitrary memory access. Users are strongly encouraged to update their packages to the latest version to mitigate risks. Utilizing tools like Vulert can further enhance your ability to monitor and manage vulnerabilities in your software.
See every vulnerability recorded for libpcap →
FAQ
The vulnerability can lead to arbitrary memory access, potentially allowing attackers to execute malicious code or access sensitive data.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
All versions prior to the patched version 14:1.10.0-4.el9_8.1 are affected by this vulnerability.
Yes, Vulert allows you to monitor and alert in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
If immediate updates are not possible, consider implementing access restrictions to the network interfaces monitored by libpcap as a temporary workaround.
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