CVE-2026-121944
Medium
Description
sngrep through 1.9.0 contains an infinite loop vulnerability in capture_packet_reasm_ip() in src/capture.c that allows attackers to cause denial of service via crafted NFLOG TLVs. Attackers can supply a pcap file with link type NFLOG containing a non-payload TLV with length under 4, making the capture thread spin at full CPU and stop processing packets.
SeverityMedium
CVSS5.5
Exploit probability—
ProductSngrep
PublishedNov 4, 2026
First seenNov 4, 2026
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| sngrep | v ≤ 1.9.0 | — |
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