CVE-2026-6554
High
Description
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. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.
SeverityHigh
CVSS7.5
Exploit probability—
ProductThe Tcpdump Group Libpcap
PublishedSep 5, 2026
First seenSep 5, 2026
Weakness typeCWE-835CWE-835
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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