CVE-2026-0799
High
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductThe Tcpdump Group Libpcap
PublishedSep 5, 2026
First seenSep 5, 2026
How to fix
Update
- The Tcpdump Group libpcap1.10.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| The Tcpdump Group libpcap | v < 1.10.7 | 1.10.7 |
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