CVE-2026-0799: The Tcpdump Group Libpcap

High severity, CVSS 8.7. EPSS: 0.1% chance of exploitation in the next 30 days.

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: before 1.10.7 (fixed in 1.10.7)

Published 2026-09-05. Last modified 2026-09-08.