SB20260827146 - Remote denial of service in rsyslog

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Main Vulnerability Database SB20260827146

SB20260827146 - Remote denial of service in rsyslog

Published: August 27, 2026

Security Bulletin ID SB20260827146
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) Heap-based buffer overflow (CVE-ID: CVE-2026-78002)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to heap-based buffer overflow in the RainerScript replace() and three-argument wrap() implementation when processing attacker-controlled message content from network input with an affected ruleset. A remote attacker can send a specially crafted message to cause a denial of service.

Exposure requires a configuration that applies replace() or three-argument wrap() to untrusted message data received from a network input.


Remediation

Install update from vendor's website.

References