Vulnerability in Irontec Sngrep
CVE-2026-121944
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/irontec/sngrep/issues/589 (issue-tracking)
- hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read (third-party-advisory)
- github.com/irontec/sngrep/blob/v1.9.0/src/capture.c (technical-description)
- www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted… (third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2026-121944?
- CVE-2026-121944 is a medium-severity vulnerability in Irontec Sngrep, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2026-11-04.
- How severe is CVE-2026-121944?
- Medium severity. CVSS v3 base score is 5.5 out of 10.