CVE-2026-78002Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function
Updated under an hour ago ()
Does this affect you?
It affects Red Hat Enterprise Linux 10 and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-131
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:8.2510.0-5.el10_2.2 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:8.2412.0-1.el10_0.2 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:8.2412.0-1.el9_6.2 not affected | CNA record |
Red Hat Red Hat Update Infrastructure 5 redhat:rhui | from 1790241900 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:69540vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:69541vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:71603vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:80817vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:81321vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:84576vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-78002vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2521135issue-tracking, x-refsource-redhat
- https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3
- http://www.openwall.com/lists/oss-security/2026/08/29/1
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.