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CVE-2026-0799

high CVSS 8.7 EPSS 0.1%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-0799 applies to, and the release that fixes it where the sources name one.

libpcap 1.10.5 fixed in 1.10.7

At a glance

Severity
High
CVSS base score
8.7 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.1% probability of exploitation in the next 30 days, higher than 1% of scored vulnerabilities
Weakness
CWE-125
Published
2026-09-05
NVD CVE.org

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