RHSA-2026:68504HighCVSS 8.8

Red Hat Security Advisory: osbuild-composer security update

Published
September 17, 2026
Last Modified
September 19, 2026

🔗 CVE IDs covered (19)

CVE-2026-56859 →CVE-2026-32280 →CVE-2026-56862 →CVE-2026-42499 →CVE-2026-56860 →CVE-2024-9355 →CVE-2024-45336 →CVE-2026-32281 →CVE-2026-32282 →CVE-2026-33810 →CVE-2026-33818 →CVE-2026-39820 →CVE-2026-42504 →CVE-2025-22866 →CVE-2025-68121 →CVE-2026-32283 →CVE-2026-39821 →CVE-2026-56853 →CVE-2026-56858 →

📋 Description

CVE-2024-9355 — golang-fips: Golang FIPS zeroed buffer CVE-2024-45336 — golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect CVE-2025-22866 — crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec CVE-2025-68121 — crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption CVE-2026-32280 — crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building CVE-2026-32281 — crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation CVE-2026-32282 — golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root CVE-2026-32283 — crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages CVE-2026-33810 — crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application CVE-2026-33818 — encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal CVE-2026-39820 — net/mail: golang: Go net/mail: Denial of Service via crafted email inputs CVE-2026-39821 — golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing CVE-2026-42499 — net/mail: golang: net/mail: Denial of Service via pathological email address parsing CVE-2026-42504 — mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header CVE-2026-56853 — net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service CVE-2026-56858 — html/template: golang: Go html/template: Cross-Site Scripting via pathological input CVE-2026-56859 — encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue CVE-2026-56860 — net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution CVE-2026-56862 — crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages

🎯 Affected products31

  • Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-0:75-10.el8_8.src as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-0:75-10.el8_8.src as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-core-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-core-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-core-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-core-debuginfo-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-core-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-core-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-debuginfo-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-debugsource-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-debugsource-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-debugsource-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-dnf-json-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-dnf-json-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-dnf-json-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-tests-debuginfo-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-tests-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-tests-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-worker-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-worker-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-worker-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • osbuild-composer-worker-debuginfo-0:75-10.el8_8.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • osbuild-composer-worker-debuginfo-0:75-10.el8_8.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • +1 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds. Workaround: To mitigate this issue, restrict network access to services that process MIME headers from untrusted sources. Implement input validation and sanitization for all incoming data, especially MIME headers, to prevent maliciously crafted content from being processed by applications utilizing the vulnerable Golang MIME package.

🔗 References (22)