Issued:
2026-09-08
Updated:
2026-09-08

RHSA-2026:65534 - Important: image-builder security update

Synopsis

Important: image-builder security update

Type/Severity

Security Advisory: Important

Topic

An update for image-builder is now available for Red Hat Enterprise Linux 10.

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.

Description

A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood.

Security Fix(es):

  • crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)

  • crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)

  • crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)

  • net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)

  • net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)

  • net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)

  • golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)

  • mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

  • 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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for x86_6410x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support10.2x86_64
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle10.2x86_64
Red Hat Enterprise Linux for x86_64 - 4 years of updates10.2x86_64
Red Hat Enterprise Linux for Power, little endian10ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Update Support10.2ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle10.2ppc64le
Red Hat Enterprise Linux for Power, little endian - 4 years of support10.2ppc64le
Red Hat Enterprise Linux for IBM z Systems10s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support10.2s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle10.2s390x
Red Hat Enterprise Linux for IBM z Systems - 4 years of updates10.2s390x
Red Hat Enterprise Linux for ARM 6410aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support10.2aarch64
Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle10.2aarch64
Red Hat Enterprise Linux for ARM 64 - 4 years of updates10.2aarch64

Updated Packages

  • image-builder-52.1-1.el10_2.2.src.rpm
  • image-builder-52.1-1.el10_2.2.x86_64.rpm
  • image-builder-debuginfo-52.1-1.el10_2.2.aarch64.rpm
  • image-builder-52.1-1.el10_2.2.s390x.rpm
  • image-builder-52.1-1.el10_2.2.aarch64.rpm
  • image-builder-debuginfo-52.1-1.el10_2.2.ppc64le.rpm
  • image-builder-debugsource-52.1-1.el10_2.2.ppc64le.rpm
  • image-builder-debuginfo-52.1-1.el10_2.2.x86_64.rpm
  • image-builder-debuginfo-52.1-1.el10_2.2.s390x.rpm
  • image-builder-52.1-1.el10_2.2.ppc64le.rpm
  • image-builder-debugsource-52.1-1.el10_2.2.aarch64.rpm
  • image-builder-debugsource-52.1-1.el10_2.2.s390x.rpm
  • image-builder-debugsource-52.1-1.el10_2.2.x86_64.rpm

Fixes

CVEs

References

Additional information