CVE-2026-78002
Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function
CVSS Score
7.5
EPSS Score
0.7%
EPSS Percentile
51th
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.
| CWE | CWE-131 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Aug 27, 2026 |
| Last Updated | Sep 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Update Infrastructure 5
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:69540 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:69541 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:71603 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-78002 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2521135 github.com: https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3 openwall.com: http://www.openwall.com/lists/oss-security/2026/08/29/1