RHEL 9 : skopeo (RHSA-2026:70641)

medium Nessus Plugin ID 349625

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Synopsis

The remote Red Hat host is missing one or more security updates for skopeo.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:70641 advisory.

Command line utility to inspect images and repositories directly on Docker registries without the need to pull them.

Security Fix(es):

* skopeo: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)

* skopeo: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)

* skopeo: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)

* skopeo: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)

* skopeo: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 RHEL skopeo package based on the guidance in RHSA-2026:70641.

Plugin Details

Severity: Medium

ID: 349625

File Name: redhat-RHSA-2026-70641.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/24/2026

Updated: 9/24/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.28

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-56858

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9, cpe:/o:redhat:rhel_eus:9.8, p-cpe:/a:redhat:enterprise_linux:skopeo-tests, p-cpe:/a:redhat:enterprise_linux:skopeo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2026

Vulnerability Publication Date: 8/13/2026

Reference Information

CVE: CVE-2025-11395, CVE-2026-33818, CVE-2026-56853, CVE-2026-56858, CVE-2026-56860, CVE-2026-56862

CWE: 1050, 277, 770, 776, 79

RHSA: 2026:70641

Detections

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