Critical Out-of-Bounds Vulnerability in libpcap Package
Summary
RLSA-2026:76045: Important: libpcap security update. Affects libpcap versions < 4:1.9.1-6.el8_10. Fixed in 4:1.9.1-6.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 enables the collection of network statistics, security monitoring, and debugging of network issues. Given its critical role in network analysis, any vulnerabilities within libpcap can have severe implications for system security and data integrity.
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 unauthorized data exposure or system crashes. The vulnerability arises from improper handling of memory boundaries, making it possible for malicious actors to exploit this weakness to execute arbitrary code or manipulate system behavior.
How To Fix
Minimum fixed version
4:1.9.1-6.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 measure, users can limit the use of libpcap in their applications until the package is updated. Additionally, restricting access to network monitoring tools that rely on libpcap may help reduce exposure to potential attacks.
Conclusion
The out-of-bounds vulnerability in the libpcap package poses significant risks to system security. It is crucial for users to update to the latest patched version to safeguard against potential exploits. Utilizing tools like Vulert can further enhance security by monitoring for vulnerabilities in real-time.
See every vulnerability recorded for libpcap →
FAQ
CVE-2026-0799 is a critical out-of-bounds vulnerability in the libpcap library that allows arbitrary memory access, potentially leading to unauthorized data exposure or system crashes.
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 by this vulnerability.
The CVSS score for CVE-2026-0799 is 8.7, indicating a high severity level that requires immediate attention.
If an immediate update is not possible, consider limiting the use of libpcap in your applications and restricting access to tools that utilize it as a temporary workaround.
The libpcap library is maintained by the Rocky Enterprise Software Foundation and Red Hat, who provide updates and security patches.
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