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SUSE SLES15 Security Update : unbound (SUSE-SU-2026:4624-1)

critical Nessus Plugin ID 365323

Synopsis

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

Description

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4624-1 advisory.

 - CVE-2026-77860: 'serve-expired' can bypass Unbound 'wait-limit' (bsc#1280403).
 - CVE-2026-77955: Possible ZONEMD verification bypass window (bsc#1280404).
 - CVE-2026-78227: Use-after-free in DoQ stream output buffer on reset re-transmission (bsc#1280405).
 - CVE-2026-80225: Possible degradation of service from continuous queries on the same TCP/DoT connection (bsc#1280406).
 - CVE-2026-81634: Possible heap buffer overflow during DNSSEC canonicalization (bsc#1280409).
 - CVE-2026-81642: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY (bsc#1280411).
 - CVE-2026-82717: CNAME synthesis could lead to heap corruption (bsc#1280412).
 - CVE-2026-82720: Use-after-free in DoH stream cleanup code path (bsc#1280413).
 - CVE-2026-85501: Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC (bsc#1280414).

 Changes for libunbound-devel-mini:

 - Updated to version 1.26.1

 Changes for unbound:

 - Updated to version 1.26.1

Tenable has extracted the preceding description block directly from the SUSE 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 libunbound8, unbound-anchor and / or unbound-devel packages.

See Also

https://bugzilla.suse.com/1280403

https://bugzilla.suse.com/1280404

https://bugzilla.suse.com/1280405

https://bugzilla.suse.com/1280406

https://bugzilla.suse.com/1280409

https://bugzilla.suse.com/1280411

https://bugzilla.suse.com/1280412

https://bugzilla.suse.com/1280413

https://bugzilla.suse.com/1280414

https://www.suse.com/security/cve/CVE-2026-50248

https://www.suse.com/security/cve/CVE-2026-77860

https://www.suse.com/security/cve/CVE-2026-77955

https://www.suse.com/security/cve/CVE-2026-78227

https://www.suse.com/security/cve/CVE-2026-80225

https://www.suse.com/security/cve/CVE-2026-81634

https://www.suse.com/security/cve/CVE-2026-81642

https://www.suse.com/security/cve/CVE-2026-82717

https://www.suse.com/security/cve/CVE-2026-82720

https://www.suse.com/security/cve/CVE-2026-85501

http://www.nessus.org/u?ebdfa37b

Plugin Details

Severity: Critical

ID: 365323

File Name: suse_SU-2026-4624-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/13/2026

Updated: 10/13/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.7

Percentile: 98.93

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-2026-82717

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

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

CVSS Score Source: CVE-2026-81642

Vulnerability Information

CPE: cpe:/o:novell:suse_linux:15, p-cpe:/a:novell:suse_linux:libunbound8, p-cpe:/a:novell:suse_linux:unbound-anchor, p-cpe:/a:novell:suse_linux:unbound-devel

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/12/2026

Vulnerability Publication Date: 7/22/2026

Reference Information

CVE: CVE-2026-50248, CVE-2026-77860, CVE-2026-77955, CVE-2026-78227, CVE-2026-80225, CVE-2026-81634, CVE-2026-81642, CVE-2026-82717, CVE-2026-82720, CVE-2026-85501

SuSE: SUSE-SU-2026:4624-1