Detections
Analytics
AlmaLinux 9 : skopeo (ALSA-2026:70641)
medium Nessus Plugin ID 349757
Synopsis
The remote AlmaLinux host is missing one or more security updates.Description
The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:70641 advisory.* 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:](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)
Tenable has extracted the preceding description block directly from the AlmaLinux 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 skopeo and / or skopeo-tests packages.See Also
Plugin Details
Severity: Medium
ID: 349757
File Name: alma_linux_ALSA-2026-70641.nasl
Version: 1.1
Type: Local
Family: Alma Linux Local Security Checks
Published: 9/24/2026
Updated: 9/24/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5
Percentile: 93.28
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:alma:linux:9, cpe:/o:alma:linux:9::appstream, cpe:/o:alma:linux:9::baseos, cpe:/o:alma:linux:9::crb, cpe:/o:alma:linux:9::highavailability, cpe:/o:alma:linux:9::nfv, cpe:/o:alma:linux:9::realtime, cpe:/o:alma:linux:9::resilientstorage, cpe:/o:alma:linux:9::sap, cpe:/o:alma:linux:9::sap_hana, cpe:/o:alma:linux:9::supplementary, p-cpe:/a:alma:linux:skopeo-tests, p-cpe:/a:alma:linux:skopeo
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/AlmaLinux/release, Host/AlmaLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 9/23/2026
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