Vulnerability in Red Hat Enterprise Linux 10
CVE-2026-78002
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.
Published · last modified .
CVSS v3 metric
CVSS v3 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.
EPSS exploit prediction
EPSS: 0.007 (52.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-78002 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3
- af854a3a-2127-422b-91ae-364da2661108
- access.redhat.com/errata/RHSA-2026:69541 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:69540 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:71603 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-78002?
- CVE-2026-78002 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2026-08-27.
- How severe is CVE-2026-78002?
- High severity. CVSS v3 base score is 7.5 out of 10.