The Tcpdump Group vulnerabilities

CVE-2026-6554 Medium · 5.5 CWE-835 Sep 5, 2026

infinte loop in libpcap before 1.10.7

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. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.

CVE-2026-6244 Medium · 5.5 CWE-369 Sep 5, 2026

division by zero in libpcap before 1.10.7

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-2026-31912 Medium · 5.5 CWE-125 Sep 5, 2026

OOBR in libpcap before 1.10.7

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 32GiB around the buffer on 64-bit architectures and in the entire address space on 32-bit architectures.

CVE-2026-31911 Medium · 5.5 CWE-617 Sep 5, 2026

abort() in libpcap before 1.10.7 on an invalid BPF 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-2026-18313 Medium · 4.3 CWE-401 Sep 5, 2026

rpcapd memory leak in libpcap before 1.10.7

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-2026-18238 Medium · 5.0 CWE-126 Sep 5, 2026

OOBR in rpcap client in libpcap before 1.10.7

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-2026-0799 High · 8.7 CWE-125 Sep 5, 2026

OOBR and OOBW in libpcap before 1.10.7

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 starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

CVE-2025-11964 Low · 1.9 CWE-787 Dec 30, 2025

OOBW in utf_16le_to_utf_8_truncated() in libpcap

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.

CVE-2025-11961 Low · 1.9 CWE-122 Dec 30, 2025

OOBR and OOBW in pcap_ether_aton() in libpcap

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 format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

CVE-2018-16301 High · 7.8 CWE-120 Oct 3, 2019

Classic Buffer Overflow in Tcpdump

The command-line argument parser in tcpdump before 4.99.0 has a buffer overflow in tcpdump.c:read_infile(). To trigger this vulnerability the attacker needs to create a 4GB file on the local filesystem and to specify the file name as the value of the -F command-line argument of tcpdump.