PT-2026-45842 · Undefined · Undefined
Published
2026-06-02
·
Updated
2026-06-02
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CVE-2026-48682
None
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FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple packet parser ng.cpp, after validating that the packet contains at least sizeof(ipv4 header t) bytes (20 bytes), the code advances the local pointer by '4 * ipv4 header->get ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read. An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface.
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Undefined