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.

References

• https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598
• https://github.com/irontec/sngrep/issues/589
• https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read
• https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv
• https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read