Summary
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.
Fixed packages 6
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | rsyslog | 8.2112.0-2ubuntu2.5 |
| Ubuntu · 24.04 LTS 24.04:LTS | rsyslog | 8.2312.0-3ubuntu9.4 |
| Ubuntu · 26.04 LTS 26.04:LTS | rsyslog | 8.2512.0-1ubuntu4.2 |
| Ubuntu · Pro 16.04 LTS Pro:16.04:LTS | rsyslog | 8.16.0-1ubuntu3.1+esm3 |
| Ubuntu · Pro 18.04 LTS Pro:18.04:LTS | rsyslog | 8.32.0-1ubuntu4.2+esm1 |
| Ubuntu · Pro 20.04 LTS Pro:20.04:LTS | rsyslog | 8.2001.0-1ubuntu1.3+esm1 |
Vulnerabilities 1
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High 7.5
Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function
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 durin…
References
-
report
https://ubuntu.com/security/CVE-2026-78002