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CVE-2026-93403 is a stack-based buffer overflow in rsyslog's mmpstrucdata output module affecting versions before 8.2606.0. An unauthenticated remote sender can trigger the flaw by delivering a crafted RFC 5424 syslog message to an affected rsyslog instance.
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A medium-severity, remotely reachable stack-based buffer overflow in rsyslog's mmpstrucdata output module. A crafted RFC 5424 log message from an unauthenticated sender can crash rsyslogd, causing denial of service.
An unpatched, network-exploitable vulnerability tracked as CVE-2026-93403, assessed at CVSS v3.0 AV:N/AC:L/PR:N/UI:N with high confidentiality, integrity, and availability impact. The referenced affected environment is Debian Linux 12.0 with rsyslog.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.