SB20260720175 - Stack-based buffer overflow in rsyslog

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Main Vulnerability Database SB20260720175

SB20260720175 - Stack-based buffer overflow in rsyslog

Published: July 20, 2026

Security Bulletin ID SB20260720175
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Stack-based buffer overflow (CVE-ID: CVE-2026-61548)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to stack-based buffer overflow in the mmpstrucdata plugin parseSD_PARAM()/parsePARAM_VALUE() handling when parsing oversized RFC5424 structured-data parameter values. A remote attacker can send a specially crafted RFC5424 message to cause a denial of service.

Only deployments where the optional plugin is installed, explicitly loaded and used, attacker-controlled RFC5424 structured data reaches that action, and MaxMessageSize is high enough to permit an oversized parameter value are vulnerable.


Remediation

Install update from vendor's website.

References