RHSA-2026:92372HighCVSS 7.5

Red Hat Security Advisory: osbuild-composer security update

Published
October 29, 2026
Last Modified
November 3, 2026

🔗 CVE IDs covered (7)

CVE-2026-42504 →CVE-2026-78667 →CVE-2026-78669 →CVE-2026-84445 →CVE-2026-94440 →CVE-2026-97031 →CVE-2026-111943 →

📋 Description

CVE-2026-42504 — mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header CVE-2026-78667 — net/http: golang: golang: Denial of Service via crafted HTTP Range headers CVE-2026-78669 — net/http: net/http/internal/http2: golang.org/x/net/http2: net/http: Denial of Service via excessive HTTP/2 SETTINGS frames CVE-2026-84445 — google.golang.org/grpc: gRPC-Go: Denial of Service via malformed RPC requests CVE-2026-94440 — net/textproto: mime/multipart: golang: golang: Denial of Service via memory limit bypass in multipart form parsing CVE-2026-97031 — crypto/tls: golang: crypto/tls: Denial of Service via multiple ECH outer extension references CVE-2026-111943 — crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates

🎯 Affected products38

  • Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-0:76.1-10.el9_2.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-debuginfo-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-debuginfo-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-debuginfo-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-core-debuginfo-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debuginfo-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debuginfo-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debuginfo-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debuginfo-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debugsource-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debugsource-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debugsource-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-debugsource-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-dnf-json-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-dnf-json-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-dnf-json-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-dnf-json-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-tests-debuginfo-0:76.1-10.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-tests-debuginfo-0:76.1-10.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-tests-debuginfo-0:76.1-10.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • osbuild-composer-tests-debuginfo-0:76.1-10.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • +8 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: 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. 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: In case you consume HTTP2, upgrade to a patched version of the http module. Verify: ``` go version go list -m golang.org/x/net govulncheck ./... ``` Workaround: See the security bulletin for a detailed mitigation procedure.

🔗 References (10)