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.
Published: 2026-11-04
Score: 6.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 04 Nov 2026 12:45:00 +0000

Type Values Removed Values Added
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.
Title sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV
First Time appeared Irontec
Irontec sngrep
Weaknesses CWE-835
CPEs cpe:2.3:a:irontec:sngrep:*:*:*:*:*:*:*:*
Vendors & Products Irontec
Irontec sngrep
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.8, 'vector': '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'}

Subscriptions

Irontec Sngrep
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-04T12:31:21.803Z

Reserved: 2026-11-04T12:05:51.303Z

Link: CVE-2026-121944

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-04T13:17:29.123

Modified: 2026-11-04T13:17:29.253

Link: CVE-2026-121944

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses