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RHEL 8 : osbuild-composer (RHSA-2026:66016)
high Nessus Plugin ID 344357
Synopsis
The remote Red Hat host is missing one or more security updates for osbuild-composer.Description
The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:66016 advisory.A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients.
Security Fix(es):
* golang-fips: Golang FIPS zeroed buffer (CVE-2024-9355)
* golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect (CVE-2024-45336)
* net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)
* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
* encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)
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 osbuild-composer package based on the guidance in RHSA-2026:66016.See Also
https://access.redhat.com/errata/RHSA-2026:66016
https://access.redhat.com/security/updates/classification/#important
https://bugzilla.redhat.com/show_bug.cgi?id=2315719
https://bugzilla.redhat.com/show_bug.cgi?id=2341751
https://bugzilla.redhat.com/show_bug.cgi?id=2467820
https://bugzilla.redhat.com/show_bug.cgi?id=2480756
https://bugzilla.redhat.com/show_bug.cgi?id=2515815
https://bugzilla.redhat.com/show_bug.cgi?id=2515820
https://bugzilla.redhat.com/show_bug.cgi?id=2515827
https://bugzilla.redhat.com/show_bug.cgi?id=2515838
https://bugzilla.redhat.com/show_bug.cgi?id=2515839
Plugin Details
Severity: High
ID: 344357
File Name: redhat-RHSA-2026-66016.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Red Hat Local Security Checks
Published: 9/9/2026
Updated: 9/9/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.8
Percentile: 57.83
Vendor
Vendor Severity: Important
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-39820
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 7.6
Threat Score: 5
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CVSS Score Source: CVE-2024-9355
Vulnerability Information
CPE: cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:rhel_eus:8.10, p-cpe:/a:redhat:enterprise_linux:osbuild-composer-core, p-cpe:/a:redhat:enterprise_linux:osbuild-composer-worker, p-cpe:/a:redhat:enterprise_linux:osbuild-composer
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: 9/9/2026
Vulnerability Publication Date: 10/1/2024
Reference Information
CVE: CVE-2024-45336, CVE-2024-9355, CVE-2026-33818, CVE-2026-39820, CVE-2026-39821, CVE-2026-56853, CVE-2026-56858, CVE-2026-56859, CVE-2026-56860, CVE-2026-56862