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Fedora 43 : unbound (2026-3223ded15e)

critical Nessus Plugin ID 318268

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Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3223ded15e advisory.

 # Update to 1.25.1 (rhbz#2480119)


 - Fix [CVE-2026-33278](https://nlnetlabs.nl/downloads/unbound/CVE-2026-33278.txt), Possible remote code execution during DNSSEC validation. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-42944](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42944.txt), Heap overflow and crash with multiple nsid, cookie, padding EDNS options. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-42959](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42959.txt), Crash during DNSSEC validation of malicious content. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-32792](https://nlnetlabs.nl/downloads/unbound/CVE-2026-32792.txt), Packet of death with DNSCrypt. Thanks to Andrew Griffiths from 'calif.io' for the report.
 - Fix [CVE-2026-40622](https://nlnetlabs.nl/downloads/unbound/CVE-2026-40622.txt), Ghost domain name variant. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-41292](https://nlnetlabs.nl/downloads/unbound/CVE-2026-41292.txt), Parsing a long list of incoming EDNS options degrades performance. Thanks to GitHub user 'N0zoM1z0', also Qifan Zhang from Palo Alto Networks, for the report.
 - Fix [CVE-2026-42534](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42534.txt), Jostle logic bypass degrades resolution performance. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-42923](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42923.txt), Degradation of service with unbounded NSEC3 hash calculations. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-42960](https://nlnetlabs.nl/downloads/unbound/CVE-2026-42960.txt), Possible cache poisoning attack while following delegation. Thanks to TaoFei Guo from Peking University, Yang Luo and JianJun Chen, Tsinghua University, for the report.
 - Fix [CVE-2026-44390](https://nlnetlabs.nl/downloads/unbound/CVE-2026-44390.txt), Unbounded name compression in certain cases causes degradation of service. Thanks to Qifan Zhang, Palo Alto Networks, for the report.
 - Fix [CVE-2026-44608](https://nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt), Use after free and crash in RPZ code. Thanks to Qifan Zhang, Palo Alto Networks, for the report.

 Swapped sources signature source number with systemd unit to have them close.

Tenable has extracted the preceding description block directly from the Fedora 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

Update the affected unbound package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-3223ded15e

Plugin Details

Severity: Critical

ID: 318268

File Name: fedora_2026-3223ded15e.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/3/2026

Updated: 6/3/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-33278

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

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

CVSS Score Source: CVE-2026-42960

CVSS v4

Risk Factor: Critical

Base Score: 10

Threat Score: 9.1

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

CPE: p-cpe:/a:fedoraproject:fedora:unbound, cpe:/o:fedoraproject:fedora:43

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 5/20/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-32792, CVE-2026-33278, CVE-2026-40622, CVE-2026-41292, CVE-2026-42534, CVE-2026-42923, CVE-2026-42944, CVE-2026-42959, CVE-2026-42960, CVE-2026-44390, CVE-2026-44608