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Atlassian Confluence < 9.2.24 / 9.3.x < 10.2.17 / 11.0.0 (CONFSERVER-104483)

high Nessus Plugin ID 368965

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Synopsis

The remote Atlassian Confluence host is missing a security update.

Description

The version of Atlassian Confluence Server running on the remote host is affected by a vulnerability as referenced in the CONFSERVER-104483 advisory.

 - Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service.
 This issue is fixed in versions 4.1.136.Final and 4.2.16.Final. (CVE-2026-73508)

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

Solution

Upgrade to Atlassian Confluence version 9.2.24, 10.2.17, 11.0.0 or later.

See Also

https://jira.atlassian.com/browse/CONFSERVER-104483

Plugin Details

Severity: High

ID: 368965

File Name: confluence_confserver-104483.nasl

Version: 1.1

Type: Combined

Agent: windows, macosx, unix

Family: CGI abuses

Published: 10/21/2026

Updated: 10/21/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Enable CGI Scanning: true

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.61

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-73508

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/a:atlassian:confluence

Required KB Items: installed_sw/Atlassian Confluence

Exploit Ease: No known exploits are available

Patch Publication Date: 9/25/2026

Vulnerability Publication Date: 7/24/2026

Reference Information

CVE: CVE-2026-73508