CVE-2026-6554: The Tcpdump Group Libpcap

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.

Affected products

• The Tcpdump Group Libpcap: before 1.10.7 (fixed in 1.10.7)

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