Critical Out-of-Bounds Vulnerability in libpcap Package
Summary
RLSA-2026:74442: Important: libpcap security update. Affects libpcap versions < 4:1.10.4-7.el10_2.1. Fixed in 4:1.10.4-7.el10_2.1. 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, performing security monitoring, and debugging network issues. The library is integral to various network analysis tools and applications, making its security paramount. The recent vulnerability poses a significant risk to systems utilizing this package, as it allows unauthorized access to memory.
Vulnerability Detail
The vulnerability identified as CVE-2026-0799 is an out-of-bounds read and write issue in the libpcap library. This flaw allows attackers to access arbitrary memory locations, potentially leading to data corruption, unauthorized data exposure, or system crashes. The vulnerability arises from improper handling of memory boundaries, making it critical for users of the library to address it promptly to prevent exploitation.
How To Fix
Minimum fixed version
4:1.10.4-7.el10_2.1
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 libpcap in their applications until the package is updated. This may involve disabling certain features that rely on libpcap or using alternative libraries for network monitoring.
Conclusion
The libpcap library is critical for network monitoring and analysis, and the identified vulnerability (CVE-2026-0799) poses serious risks. Users are strongly advised to update to the latest patched version to safeguard their systems. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2026-0799 is a security vulnerability in the libpcap library that allows for out-of-bounds memory access, potentially leading to data corruption or unauthorized access.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The vulnerability can lead to data corruption, unauthorized data exposure, and system crashes, posing significant risks to applications relying on libpcap.
Yes, a patched version of libpcap is available. Users should update to version 4:1.10.4-7.el10_2.1 to mitigate the risk.
The CVSS score for CVE-2026-0799 is 8.7, indicating a high severity level.
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