ALSA-2026:66016

    Dashboard / Vulnerabilities / ALSA-2026:66016

    ALSA-2026:66016

    Published: 9 Sept 2026Last Modified: 10 Sept 2026

    Summary: Important: osbuild-composer security update

    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-fips: Golang FIPS zeroed buffer (CVE-2024-9355) * golang: net/[http:](http:) net/[http:](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:](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:](http:) golang: Go net/[http:](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.

    References: https://access.redhat.com/errata/RHSA-2026:66016, https://access.redhat.com/security/cve/CVE-2024-45336, https://access.redhat.com/security/cve/CVE-2024-9355, https://access.redhat.com/security/cve/CVE-2026-33818, https://access.redhat.com/security/cve/CVE-2026-39820, https://access.redhat.com/security/cve/CVE-2026-39821, https://access.redhat.com/security/cve/CVE-2026-56853, https://access.redhat.com/security/cve/CVE-2026-56858, https://access.redhat.com/security/cve/CVE-2026-56859, https://access.redhat.com/security/cve/CVE-2026-56860, https://access.redhat.com/security/cve/CVE-2026-56862, https://bugzilla.redhat.com/2315719, https://bugzilla.redhat.com/2341751, https://bugzilla.redhat.com/2467820, https://bugzilla.redhat.com/2480756, https://bugzilla.redhat.com/2515815, https://bugzilla.redhat.com/2515820, https://bugzilla.redhat.com/2515827, https://bugzilla.redhat.com/2515838, https://bugzilla.redhat.com/2515839, https://bugzilla.redhat.com/2515840, https://errata.almalinux.org/8/ALSA-2026-66016.html

    Affected packages

    Package

    Name: osbuild-composer

    Purl: pkg:rpm/almalinux/osbuild-composer

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -101.5-2.el8_10.alma.1

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    ALSA-2026:66016 | CVE-DB