Red HatCVE-2026-78002
Red Hat rsyslog: buffer overflow
High7.5CVE-2026-78002 · Published Aug 27, 2026 · updated Sep 25, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 6 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat Enterprise Linux 7 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 8 Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-131
- www.cve.org/CVERecord?id=CVE-2026-78002
- nvd.nist.gov/vuln/detail/CVE-2026-78002
- access.redhat.com/errata/RHSA-2026:69540
- access.redhat.com/errata/RHSA-2026:69541
- access.redhat.com/errata/RHSA-2026:71603
- access.redhat.com/security/cve/CVE-2026-78002
- bugzilla.redhat.com/show_bug.cgi?id=2521135
- github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3
- www.openwall.com/lists/oss-security/2026/08/29/1
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