CVE-2026-121943

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    CVE-2026-121943

    Published: 4 Nov 2026Last Modified: 5 Nov 2026

    Summary: Irontec sngrep through 1.9.0 Out-of-Bounds Stack Read via sip_check_packet

    Details: Irontec sngrep through 1.9.0 contains an out-of-bounds stack read vulnerability in sip_check_packet and sip_validate_packet caused by an off-by-one length check on 10240-byte SIP payloads. Remote attackers can send a crafted UDP or TCP SIP packet or supply a pcap file to crash sngrep or leak adjacent stack bytes into displayed SIP fields.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121943.json, https://hackmd.io/@haindpwn/sngrep-sip-payload-missing-nul-oob-read, https://nvd.nist.gov/vuln/detail/CVE-2026-121943, https://www.vulncheck.com/advisories/irontec-sngrep-through-1.9.0-out-of-bounds-stack-read-via-sip-check-packet, https://github.com/irontec/sngrep/issues/589, https://github.com/irontec/sngrep, https://github.com/irontec/sngrep/blob/v1.9.0/src/sip.c#L396-L410, 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-2026-121943 | CVE-DB