Debian dla-4891 : rsyslog - security update

high Nessus Plugin ID 378789

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4891 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4891-1 [email protected] https://www.debian.org/lts/security/ Abhijith PA November 11, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : rsyslog Version : 8.2302.0-1+deb12u2 CVE ID : CVE-2026-19654 CVE-2026-61548 CVE-2026-78002 CVE-2026-93403

Several vulnerabilities were discovered in rsyslog, system and kernel logging daemon.

CVE-2026-19654

An unauthenticated remote peer may lead rsyslogd to crash due to a flaw in the optional imptcp module. A crafted input sequence during oversize-frame recovery can cause an invalid internal message length and terminate rsyslogd.

CVE-2026-61548

A remote unauthenticated attacker whose crafted RFC5424 message reaches an action using mmpstrucdata can provide a structured-data parameter larger than that buffer when MaxMessageSize permits it, causing an attacker-controlled stack overwrite.

CVE-2026-78002

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.

CVE-2026-93403

a stack-based buffer overflow in the mmpstrucdata output module. An unauthenticated network sender who can deliver a crafted RFC 5424 message to an affected rsyslog instance can cause rsyslogd to terminate, resulting in denial of service.

For Debian 12 bookworm, these problems have been fixed in version 8.2302.0-1+deb12u2.

We recommend that you upgrade your rsyslog packages.

For the detailed security status of rsyslog please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/rsyslog

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the rsyslog packages.

Plugin Details

Severity: High

ID: 378789

File Name: debian_DLA-4891.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 11/11/2026

Updated: 11/11/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.13

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-61548

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:rsyslog-czmq, p-cpe:/a:debian:debian_linux:rsyslog-elasticsearch, p-cpe:/a:debian:debian_linux:rsyslog-gnutls, p-cpe:/a:debian:debian_linux:rsyslog-gssapi, p-cpe:/a:debian:debian_linux:rsyslog-hiredis, p-cpe:/a:debian:debian_linux:rsyslog-kafka, p-cpe:/a:debian:debian_linux:rsyslog-kubernetes, p-cpe:/a:debian:debian_linux:rsyslog-mongodb, p-cpe:/a:debian:debian_linux:rsyslog-mysql, p-cpe:/a:debian:debian_linux:rsyslog-openssl, p-cpe:/a:debian:debian_linux:rsyslog-pgsql, p-cpe:/a:debian:debian_linux:rsyslog-relp, p-cpe:/a:debian:debian_linux:rsyslog-snmp, p-cpe:/a:debian:debian_linux:rsyslog

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 11/11/2026

Vulnerability Publication Date: 7/30/2026

Reference Information

CVE: CVE-2026-19654, CVE-2026-61548, CVE-2026-78002, CVE-2026-93403

IAVA: 2026-A-0775-S, 2026-A-0983

Detections

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