Detections
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Alpine: multiple zlib packages: security update to 1.3.2-r1

high Tenable Self-Hosted Container Security Plugin ID 473477

Description

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

 - zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate()
 function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers
 can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked
 memmove() to write beyond the internal input buffer boundary. (CVE-2026-85091)

Solution

Update the zlib library and its related packages to version 1.3.2-r1 or later.

See Also

https://security.alpinelinux.org/vuln/CVE-2026-85091

Plugin Details

Severity: High

ID: 473477

Version: Revision 1.1

Type: Local

Published: 10/7/2026

Updated: 10/7/2026

Supported Sensors: Agentless Assessment

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.47

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-85091

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

CVSS v4

Risk Factor: High

Base Score: 8.3

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/3/2026

Reference Information

CVE: CVE-2026-85091