CVE-2026-78002 — Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

Affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Update Infrastructure 5, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7

A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.

USN-8786-1 — rsyslog vulnerability

Affected: Ubuntu:Pro:16.04:LTS: rsyslog, Ubuntu:Pro:18.04:LTS: rsyslog, Ubuntu:Pro:20.04:LTS: rsyslog, Ubuntu:22.04:LTS: rsyslog, Ubuntu:24.04:LTS: rsyslog, Ubuntu:26.04:LTS: rsyslog

It was discovered that rsyslog incorrectly calculated buffer sizes when replacing strings. A remote attacker could possibly use this issue to cause rsyslog to crash, resulting in a denial of service.

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CVE-2026-78002 — Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

USN-8786-1 — rsyslog vulnerability