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    CVE-2026-18238

    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.

    Published:Sep 5, 2026
    Last Modified:Sep 8, 2026
    EPS:Sep 5, 2026
    EPSS Score:0.00176
    CVSS Score:5

    Affected Products

    Vendor
    Tcpdump
    Product
    Libpcap

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-6244 (CVSS 5.5) — libpcap BPF interpreter for the 'div #k' and 'mod #k' ALU instructions does not check whether the immediate va…
    CVE-2026-31911 (CVSS 5.5) — libpcap BPF interpreter calls abort() if it encounters a BPF instruction that has an invalid opcode. In parti…
    CVE-2026-31912 (CVSS 5.5) — libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return …
    CVE-2026-0799 (CVSS 8.7) — In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigne…
    CVE-2025-11964 (CVSS 1.9) — On Windows only, if libpcap needs to convert a Windows error message to UTF-8 and the message includes charact…
    CVE-2025-11961 (CVSS 1.9) — pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size all…
    CVE-2024-8006 (CVSS 4.4) — Remote packet capture support is disabled by default in libpcap. When a user builds libpcap with remote packe…
    CVE-2023-7256 (CVSS 4.4) — In affected libpcap versions during the setup of a remote packet capture the internal function sock_initaddres…

    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