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High 7.5Published Aug 27, 2026

CVE-2026-78002Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

Updated under an hour ago ()

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It affects Red Hat Enterprise Linux 10 and 5 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 26, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
from 0:8.2510.0-5.el10_2.2 not affected
CNA record
from 0:8.2412.0-1.el10_0.2 not affected
CNA record
from 0:8.2102.0-13.el8_8.1 not affected
CNA record
from 0:8.2102.0-13.el8_8.1 not affected
CNA record
from 0:8.2412.0-1.el9_6.2 not affected
CNA record
from 1790241900 not affected
CNA record

References

References

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.

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