CVE-2026-78002
Publication date 27 August 2026
Last updated 21 September 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| rsyslog | 26.04 LTS resolute |
Fixed 8.2512.0-1ubuntu4.2
|
| 24.04 LTS noble |
Fixed 8.2312.0-3ubuntu9.4
|
|
| 22.04 LTS jammy |
Fixed 8.2112.0-2ubuntu2.5
|
|
| 20.04 LTS focal |
Fixed 8.2001.0-1ubuntu1.3+esm1
|
|
| 18.04 LTS bionic |
Fixed 8.32.0-1ubuntu4.2+esm1
|
|
| 16.04 LTS xenial |
Fixed 8.16.0-1ubuntu3.1+esm3
|
|
| 14.04 LTS trusty |
Not affected
|
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CVSS version: CVSS v3.0
Base score
7.5 · High
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8786-1
- rsyslog vulnerability
- 21 September 2026