RHSA-2026:67148HighCVSS 7.5

Red Hat Security Advisory: osbuild-composer security update

Published
September 14, 2026
Last Modified
September 19, 2026

🔗 CVE IDs covered (6)

CVE-2026-55677 →CVE-2025-22866 →CVE-2026-32281 →CVE-2026-41178 →CVE-2026-42499 →CVE-2026-42504 →

📋 Description

CVE-2025-22866 — crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec CVE-2026-32281 — crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation CVE-2026-41178 — github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage: go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers 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-2026-55677 — github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy

🎯 Affected products34

  • Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-0:101.5-3.el8_10.src as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-debuginfo-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-debuginfo-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-debuginfo-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-core-debuginfo-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debuginfo-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debuginfo-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debuginfo-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debuginfo-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debugsource-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debugsource-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debugsource-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-debugsource-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-tests-debuginfo-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-tests-debuginfo-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-tests-debuginfo-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-tests-debuginfo-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-worker-0:101.5-3.el8_10.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-worker-0:101.5-3.el8_10.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-worker-0:101.5-3.el8_10.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • osbuild-composer-worker-0:101.5-3.el8_10.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • +4 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: 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 (9)