CVE-2026-18238

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    CVE-2026-18238

    Published: 5 Sept 2026Last Modified: 27 Sept 2026

    Summary: OOBR in rpcap client in libpcap before 1.10.7

    Details: The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers. A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.

    References: https://github.com/the-tcpdump-group/libpcap/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18238.json, https://nvd.nist.gov/vuln/detail/CVE-2026-18238, https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 8c6c412779eb5bc57c9d07fe5a25f8046088bef5
    Fixed -None

    Affected versions

    1.8.x

    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-2026-18238 | CVE-DB