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CVE-2026-61548 is a high-severity stack-based buffer overflow in rsyslog's optional mmpstrucdata module affecting rsyslog versions 7.5.4 through before 8.2606.0. The flaw occurs during parsing of RFC 5424 structured-data parameter values. In affected versions, parseSD_PARAM() allocates a fixed 32,768-byte stack buffer for a parameter value and passes it to parsePARAM_VALUE() without supplying the destination buffer size. parsePARAM_VALUE() then copies attacker-controlled parameter data into that buffer without proper bounds checking, with the write bounded only by the length of the structured-data input. A sufficiently large structured-data parameter value can therefore overwrite stack memory and crash the rsyslog process. The issue is present only when the optional mmpstrucdata plugin is installed, explicitly loaded, and used to process attacker-controlled RFC 5424 messages.
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