RHSA-2026:59562

Vulnerability from csaf_redhat - Published: 2026-08-25 20:13 - Updated: 2026-08-26 04:27
Summary
Red Hat Security Advisory: osbuild-composer security update
Severity
Important
Notes
Topic: An update for osbuild-composer is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 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.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass (CVE-2026-27136) * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting (CVE-2026-25681) * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering (CVE-2026-42502) 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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

A flaw was found in golang.org/x/net/html. A remote attacker could exploit this vulnerability by providing specially crafted HTML. When this arbitrary HTML is parsed and rendered, it can result in an unexpected HTML tree, bypassing input sanitization. This can be leveraged to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution in applications that use the affected component.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in golang.org/x/net/html. When arbitrary HTML is parsed and then rendered, it can result in an unexpected HTML tree. This allows an attacker to bypass HTML sanitization mechanisms, leading to Cross-Site Scripting (XSS) attacks in applications. Such attacks can result in information disclosure or arbitrary code execution.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in golang.org/x/net/html. This vulnerability allows an attacker to manipulate how HTML is processed and displayed. By providing specially crafted HTML, an attacker can cause an unexpected structure in the rendered output. This can lead to Cross-Site Scripting (XSS) attacks, where malicious scripts are executed in a user's web browser, potentially compromising user data or taking control of their session.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-core-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-debugsource-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-tests-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.x86_64
Vendor Fix fix
Workaround
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2026:59562 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480757 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480761 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480762 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-25681 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480761 external
https://www.cve.org/CVERecord?id=CVE-2026-25681 external
https://nvd.nist.gov/vuln/detail/CVE-2026-25681 external
https://go.dev/cl/781703 external
https://go.dev/issue/79574 external
https://groups.google.com/g/golang-announce/c/iI-… external
https://pkg.go.dev/vuln/GO-2026-5029 external
https://access.redhat.com/security/cve/CVE-2026-27136 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480757 external
https://www.cve.org/CVERecord?id=CVE-2026-27136 external
https://nvd.nist.gov/vuln/detail/CVE-2026-27136 external
https://go.dev/cl/781685 external
https://go.dev/issue/79575 external
https://pkg.go.dev/vuln/GO-2026-5030 external
https://access.redhat.com/security/cve/CVE-2026-39821 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://www.cve.org/CVERecord?id=CVE-2026-39821 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39821 external
https://go.dev/cl/767220 external
https://go.dev/issue/78760 external
https://pkg.go.dev/vuln/GO-2026-5026 external
https://access.redhat.com/security/cve/CVE-2026-42502 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480762 external
https://www.cve.org/CVERecord?id=CVE-2026-42502 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42502 external
https://go.dev/cl/781701 external
https://go.dev/issue/79572 external
https://pkg.go.dev/vuln/GO-2026-5027 external

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      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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        "category": "summary",
        "text": "An update for osbuild-composer is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
      },
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        "category": "general",
        "text": "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.\n\nSecurity Fix(es):\n\n* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)\n\n* golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass (CVE-2026-27136)\n\n* golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting (CVE-2026-25681)\n\n* golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering (CVE-2026-42502)\n\nFor 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.",
        "title": "Details"
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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          "title": "Vulnerability description"
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          "text": "golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting",
          "title": "Vulnerability summary"
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          "text": "This Important vulnerability in `golang.org/x/net/html` could enable remote attackers to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution. The flaw allows specially crafted HTML to bypass input sanitization during parsing and rendering. Red Hat products are affected if they process untrusted HTML content using the vulnerable component without additional output encoding or robust content security policies.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability in `golang.org/x/net/html` is rated as Important. It allows for Cross-Site Scripting (XSS) attacks by enabling an attacker to bypass HTML sanitization mechanisms when arbitrary HTML is parsed and rendered. This can lead to information disclosure or arbitrary code execution in affected applications. Exploitation typically requires user interaction, where a user processes specially crafted malicious HTML content.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "title": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass"
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      "cwe": {
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        "name": "Improper Validation of Unsafe Equivalence in Input"
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          "category": "description",
          "text": "A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "golang.org/x/net/idna is vulnerable to privilege escalation through incorrect Punycode label handling in ToASCII and ToUnicode. An attacker who can supply a Punycode hostname that passes an ASCII-only authorization check may have it normalized to a restricted ASCII name the application intended to block. Red Hat exposure is broad across products shipping the Go toolchain or bundling golang.org/x/net, including RHEL and RHEL-AI golang RPMs, hummingbird Go runtimes, OpenShift and ODF container builds, and Ceph/OpenShift components compiled against affected x/net versions.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "category": "external",
          "summary": "https://go.dev/cl/767220",
          "url": "https://go.dev/cl/767220"
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          "summary": "https://go.dev/issue/78760",
          "url": "https://go.dev/issue/78760"
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          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw in golang.org/x/net/html can lead to Cross-Site Scripting (XSS) in applications that parse and render untrusted HTML, even with sanitization attempts. This is due to an unexpected HTML tree structure, allowing malicious scripts to execute in a user\u0027s browser.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.aarch64",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.ppc64le",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.s390x",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-0:101.3-4.el9_4.5.x86_64",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.aarch64",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.ppc64le",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.s390x",
            "AppStream-9.4.0.Z.E4S:osbuild-composer-worker-debuginfo-0:101.3-4.el9_4.5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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