CVE-2026-48690

FastNetMon Community Edition through 1.2.9 contains an integer overflow vulnerability in the packet capture buffer allocation. In src/packet_storage.hpp, the allocate_buffer() function computes memory_size_in_bytes as 'buffer_size_in_packets * (max_captured_packet_size + sizeof(fastnetmon_pcap_pkthdr_t)) + sizeof(fastnetmon_pcap_file_header_t)' using unsigned int (32-bit) arithmetic. With max_captured_packet_size=1500 and sizeof(fastnetmon_pcap_pkthdr_t)=16, each packet requires approximately 1516 bytes. If buffer_size_in_packets exceeds approximately 2,832,542, the multiplication overflows, resulting in a much smaller allocation than expected. Subsequent write_packet() calls then write past the allocated buffer, causing heap corruption. The buffer_size_in_packets value is derived from the ban_details_records_count configuration parameter, which is parsed using atoi() with no overflow checking.

• CWE-122
• CWE-190

• https://github.com/pavel-odintsov/fastnetmonProduct
• https://github.com/pavel-odintsov/fastnetmon/blob/master/src/packet_storage.hppProduct
• https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48690-packet-storage-integer-overflowThird Party Advisory

Published

May 26, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-48684FastNetMon Community Edition through 1.2.9 contains an out-o…6.5
• CVE-2026-48685FastNetMon Community Edition through 1.2.9 has out-of-bounds…6.5
• CVE-2026-48686FastNetMon Community Edition through 1.2.9 contains a stack-…9.8
• CVE-2026-48687FastNetMon Community Edition through 1.2.9 contains an OS co…9.8
• CVE-2026-48688FastNetMon Community Edition through 1.2.9 contains multiple…7.5
• CVE-2026-48689FastNetMon Community Edition through 1.2.9 contains an off-b…9.8
• CVE-2026-48691FastNetMon Community Edition through 1.2.9 contains an integ…9.8
• CVE-2026-48692FastNetMon Community Edition through 1.2.9 exposes a gRPC AP…8.1
• CVE-2026-48693FastNetMon Community Edition through 1.2.9 is vulnerable to …5.5
• CVE-2026-48694FastNetMon Community Edition through 1.2.9 contains a config…8.1
• CVE-2026-48695FastNetMon Community Edition through 1.2.9 contains an OS co…8.1
• CVE-2026-48696FastNetMon Community Edition through 1.2.9 has a buffer over…6.2