CVE-2026-121944

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    CVE-2026-121944

    Published: 4 Nov 2026Last Modified: 5 Nov 2026

    Summary: sngrep through 1.9.0 Infinite Loop DoS via Crafted NFLOG TLV

    Details: 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/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121944.json, https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read, https://nvd.nist.gov/vuln/detail/CVE-2026-121944, https://www.vulncheck.com/advisories/sngrep-through-1.9.0-infinite-loop-dos-via-crafted-nflog-tlv, https://github.com/irontec/sngrep/issues/589, https://github.com/irontec/sngrep, https://github.com/irontec/sngrep/blob/v1.9.0/src/capture.c#L581-L598, https://hackmd.io/@haindpwn/cve-2026-121943-121944-sngrep-sip-payload-missing-nul-oob-read

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v1.9.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-121944 | CVE-DB