Detections
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Alpine: multiple socat packages: security update to 1.8.1.2-r0

critical Tenable Cloud Security Plugin ID 443927

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - socat versions 1.8.0.0 through 1.8.1.1 contain a heap-based buffer overflow vulnerability that allows a
 malicious SOCKS5 proxy server to overwrite adjacent heap memory by exploiting a sign-extension flaw in the
 DOMAINNAME reply parser. During connection setup, the domain name length byte is read through a signed
 char field causing a negative bytes_to_read value that is implicitly converted to size_t, resulting in an
 unbounded heap write into the 262-byte reply buffer with attacker-controlled size and content.
 (CVE-2026-56123)

Solution

Update the socat library and its related packages to version 1.8.1.2-r0 or later.

See Also

https://security.alpinelinux.org/vuln/CVE-2026-56123

Plugin Details

Severity: Critical

ID: 443927

Version: Revision 1.3

Type: Local

Published: 6/25/2026

Updated: 6/29/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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-2026-56123

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: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-56123