Detections
Analytics

Oracle Linux 10 : unbound (ELSA-2026-23231)

critical Nessus Plugin ID 328897

Synopsis

The remote Oracle Linux host is missing one or more security updates.

Description

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-23231 advisory.

 - Fix CVE-2026-42534: Jostle logic bypass degrades resolution performance
 - Fix CVE-2026-41292: DoS via excessive EDNS options
 - Add upstream unit test for CVE-2026-40622
 - Fix CVE-2026-44390: DoS with large RRsets
 - Fix CVE-2026-40622: cache manipulation via 'ghost domain names' attack
 - Fix CVE-2026-42959
 - Fix CVE-2026-42944

Tenable has extracted the preceding description block directly from the Oracle Linux 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 packages.

See Also

https://linux.oracle.com/errata/ELSA-2026-23231.html

Plugin Details

Severity: Critical

ID: 328897

File Name: oraclelinux_ELSA-2026-23231.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/22/2026

Updated: 7/22/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.92

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: 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

Vulnerability Information

CPE: cpe:/o:oracle:linux:10, p-cpe:/a:oracle:linux:python3-unbound, p-cpe:/a:oracle:linux:unbound-anchor, p-cpe:/a:oracle:linux:unbound-devel, p-cpe:/a:oracle:linux:unbound-dracut, p-cpe:/a:oracle:linux:unbound-libs, p-cpe:/a:oracle:linux:unbound-utils, p-cpe:/a:oracle:linux:unbound

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/21/2026

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-33278, CVE-2026-42944, CVE-2026-42959