CVE-2026-6554
infinte loop in libpcap before 1.10.7
CVSS Score
7.5
EPSS Score
0.1%
EPSS Percentile
1th
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.
| CWE | CWE-835 |
| Vendor | the tcpdump group |
| Product | libpcap |
| Published | Sep 5, 2026 |
| Last Updated | Oct 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
The Tcpdump Group / libpcap
0 < 1.10.7
References
Credits
🔍 Kaixuan LI has discovered the crafted filter program attack vector Denis Ovsienko has discovered the 'protochain' attack vector