{"id":"CVE-2026-122127","published":"2026-11-04T21:18:08.200","lastModified":"2026-11-04T21:18:08.200","description":"CESNET ipfixcol2 2.7.1 before 2.9.0 contains a heap-based buffer overflow in Lz4Decoder.cpp that allows unauthenticated network peers to write past heap buffers. Attackers can declare a small ring buffer_size followed by a large decompressed_size to write up to 65535 controlled bytes and crash the collector.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-787"],"vendors":[],"products":[],"references":[{"url":"https://github.com/CESNET/ipfixcol2","tags":[]},{"url":"https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/input/tcp/src/Lz4Decoder.cpp#L139-L151","tags":[]},{"url":"https://github.com/CESNET/ipfixcol2/commit/fd5cb168efb4b864d33f655174711b2779cef502","tags":[]},{"url":"https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0","tags":[]},{"url":"https://www.vulncheck.com/advisories/cesnet-ipfixcol2-2.7.1-before-2.9.0-heap-buffer-overflow-via-tcp-lz4-decoder","tags":[]}],"exploitRefs":[{"url":"https://github.com/CESNET/ipfixcol2","tags":[]},{"url":"https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/input/tcp/src/Lz4Decoder.cpp#L139-L151","tags":[]},{"url":"https://github.com/CESNET/ipfixcol2/commit/fd5cb168efb4b864d33f655174711b2779cef502","tags":[]},{"url":"https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0","tags":[]}],"hasPoc":true,"ai":null}