CVE-2026-78002
Publication date 31 August 2026
Last updated 31 August 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 |
Needs evaluation
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
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
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-78002
- https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3
- https://github.com/rsyslog/rsyslog/pull/7525
- https://github.com/rsyslog/rsyslog/commit/667e3f61aec5ee02c5c2ee6f0f8accf6fe4301a9
- https://www.openwall.com/lists/oss-security/2026/08/29/1
- https://access.redhat.com/security/cve/CVE-2026-78002
- https://bugzilla.redhat.com/show_bug.cgi?id=2521135
- http://www.openwall.com/lists/oss-security/2026/08/29/1