Vulnerability DatabaseCVE-2026-121944
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CVE-2026-121944
Published:November 04, 2026
Updated:November 05, 2026
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.
Related Resources (8)
https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv
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/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read
https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read
https://nvd.nist.gov/vuln/detail/CVE-2026-121944
https://github.com/irontec/sngrep
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121944.json
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CVSS v4
Base Score:
6.8
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.5
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Loop with Unreachable Exit Condition
CWE-835