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Vulnerability record · CVE-2026-0799 · published 5 September 2026

CVE-2026-0799: Out-of-bounds read vulnerability

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.

8.7 CVSS 3.1 High EPSS 0.11% · top 98.9% CWE-125 · Out-of-bounds readCWE-129 · CWE-129 Awaiting Analysis
8.7CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
8 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

References

LinkTags
https://github.com/the-tcpdump-group/libpcap/commit/48e8960a7108e9e828f9d7bdc7e97bdab841aec7

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-0799), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.