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CVE-2026-121944sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV
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.
6.8 MEDIUMEPSS 0.23%Not in KEVNVD: Deferred
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.8 | MEDIUM | 4.0VulnCheck (CNA) | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 5.5 | MEDIUM | 3.1VulnCheck (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-121944
- Status
- Deferred
- Assigner (CNA)
- VulnCheck
- Published
- Nov 4, 2026
- Last modified
- 2026-11-04 19:17 UTC
- Weaknesses
- CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Products
As published by the CNA in the CVE record.
irontecsngrep1 version range
- through 1.9.0
References
- github.com https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598
- github.com https://github.com/irontec/sngrep/issues/589
- hackmd.io https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read
- vulncheck.com https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv
- hackmd.io https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read