The Tcpdump Group Libpcap vulnerabilities

CVE-2023-40400 [CRITICAL] CWE-415 CVE-2023-40400: This issue was addressed with improved checks. This issue is fixed in tvOS 17, iOS 17 and iPadOS 17, This issue was addressed with improved checks. This issue is fixed in tvOS 17, iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. A remote user may cause an unexpected app termination or arbitrary code execution.

CVE-2026-0799 [HIGH] CWE-125 CVE-2026-0799: In BPF instructions that load/store a value from/to a scratch memory register the register index is In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB st

CVE-2026-6554 [HIGH] CWE-835 CVE-2026-6554: libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to imple libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.

CVE-2026-18238 [MEDIUM] CWE-126 CVE-2026-18238: The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly 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.

CVE-2026-31912 [MEDIUM] CWE-125 CVE-2026-31912: libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return instruction nor executing a jump instruction with an offset that translates to a pointer outside of the buffer. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading the OS process memory in the 3

CVE-2026-31911 [MEDIUM] CWE-617 CVE-2026-31911: libpcap BPF interpreter calls abort() if it encounters a BPF instruction that has an invalid opcode. libpcap BPF interpreter calls abort() if it encounters a BPF instruction that has an invalid opcode. In particular uncommon use cases a crafted filter program can terminate the OS process.

CVE-2026-6244 [MEDIUM] CWE-369 CVE-2026-6244: libpcap BPF interpreter for the 'div #k' and 'mod #k' ALU instructions does not check whether the im libpcap BPF interpreter for the 'div #k' and 'mod #k' ALU instructions does not check whether the immediate value is zero. In particular uncommon use cases a crafted filter program can cause a division by zero.

CVE-2026-18313 [MEDIUM] CWE-401 CVE-2026-18313: rpcapd can allocate up to 65536 bytes per each RPCAP_MSG_UPDATEFILTER_REQ or RPCAP_MSG_STARTCAP_REQ rpcapd can allocate up to 65536 bytes per each RPCAP_MSG_UPDATEFILTER_REQ or RPCAP_MSG_STARTCAP_REQ message received from the client, but it never frees the memory, so it leaks memory even under normal use. A malicious client can cause the server to leak memory substantially faster.

CVE-2024-8006 [MEDIUM] CWE-476 CVE-2024-8006: Remote packet capture support is disabled by default in libpcap. When a user builds libpcap with re Remote packet capture support is disabled by default in libpcap. When a user builds libpcap with remote packet capture support enabled, one of the functions that become available is pcap_findalldevs_ex(). One of the function arguments can be a filesystem path, which normally means a directory with input data files. When the specified path cannot be use

CVE-2025-11961 [LOW] CWE-122 CVE-2025-11961: pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixe pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected form

CVE-2025-11964 [LOW] CWE-787 CVE-2025-11964: On Windows only, if libpcap needs to convert a Windows error message to UTF-8 and the message includ On Windows only, if libpcap needs to convert a Windows error message to UTF-8 and the message includes characters that UTF-8 represents using 4 bytes, utf_16le_to_utf_8_truncated() can write data beyond the end of the provided buffer.