Critical Out-of-Bounds Vulnerability in libpcap and libpcap-devel Packages
Summary
ALSA-2026:76045: Important: libpcap security update. Affects libpcap versions < 14:1.9.1-6.el8_10. Fixed in 14:1.9.1-6.el8_10. 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, security monitoring, and debugging network issues. The libpcap-devel package includes development files for building applications that utilize libpcap. This library is crucial for network analysis tools and applications, making its security paramount.
Vulnerability Detail
The vulnerability identified as CVE-2026-0799 is an out-of-bounds read and write issue within the libpcap library. This flaw allows attackers to access arbitrary memory locations, potentially leading to data corruption, application crashes, or unauthorized access to sensitive information. The vulnerability arises from improper handling of input data, which can be exploited by crafting malicious network packets.
How To Fix
Minimum fixed version
14:1.9.1-6.el8_10
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 workaround, users can limit the exposure of applications that utilize libpcap by restricting network access or using firewall rules to block potentially malicious traffic until the package is updated.
Conclusion
The libpcap and libpcap-devel packages have a critical vulnerability (CVE-2026-0799) that allows for out-of-bounds memory access, posing serious security risks. It is essential to update these packages to the latest patched version to ensure the security of applications relying on this library. Users are encouraged to utilize tools like Vulert for real-time monitoring of vulnerabilities.
See every vulnerability recorded for libpcap →
FAQ
CVE-2026-0799 is a security vulnerability in the libpcap library that allows for out-of-bounds memory access, which can lead to data corruption or unauthorized access.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
Exploitation of this vulnerability can lead to application crashes, data corruption, or unauthorized access to sensitive information, posing significant security risks.
Yes, a patch is available. Users should update to libpcap version 14:1.9.1-6.el8_10 or later to mitigate the vulnerability.
If immediate updates are not possible, consider implementing network restrictions or firewall rules to limit exposure to potential attacks.
Related vulnerabilities
Recent vulnerabilities recorded for libpcap.
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