# CVE-2026-0799

## Summary

- **CVE ID:** CVE-2026-0799
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H)
- **CWE:** CWE-129, CWE-125, CWE-787
- **Published:** Sep 5, 2026
- **Last Modified:** Sep 8, 2026

## Description

In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value.  In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

## Affected Products

- The Tcpdump Group — libpcap (0)

## References

- [CNA](https://github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e97bdab841aec7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.11%
- **EPSS Percentile:** 1.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._