Detections
Analytics

Alpine: multiple dnsmasq packages: security update to 2.91-r1

high Tenable Cloud Security Plugin ID 441829

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

 - A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local
 attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet. (CVE-2026-4892)

 - dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to
 inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP
 address, or to cause a DoS. (CVE-2026-2291)

 - A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to
 cause a denial of service via a crafted DNS packet. (CVE-2026-4890)

 - A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers
 to cause a denial of service via a crafted DNS packet. (CVE-2026-4891)

Solution

Update the dnsmasq library and its related packages to version 2.91-r1 or later.

See Also

https://security.alpinelinux.org/vuln/CVE-2026-2291

https://security.alpinelinux.org/vuln/CVE-2026-4890

https://security.alpinelinux.org/vuln/CVE-2026-4891

https://security.alpinelinux.org/vuln/CVE-2026-4892

https://security.alpinelinux.org/vuln/CVE-2026-4893

https://security.alpinelinux.org/vuln/CVE-2026-5172

Plugin Details

Severity: High

ID: 441829

Version: Revision 1.5

Type: Local

Published: 5/14/2026

Updated: 6/30/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.98

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

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

CVSS Score Source: CVE-2026-4892

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 5/11/2026

Reference Information

CVE: CVE-2026-2291, CVE-2026-4890, CVE-2026-4891, CVE-2026-4892, CVE-2026-4893, CVE-2026-5172