Medium severity5.5NVD Advisory· Published Nov 4, 2026· Updated Nov 4, 2026

CVE-2026-121944

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.

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Affected products

Irontec/Sngrepllm-fuzzy
Range: <=1.9.0

Patches

Vulnerability mechanics

References

github.com/irontec/sngrep/blob/v1.9.0/src/capture.cnvd
github.com/irontec/sngrep/issues/589nvd
hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-readnvd
www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlvnvd

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