What is RHSA-2026:27856?

RHSA-2026:27856 is a security advisory published by Red Hat Product Security with High severity. Red Hat Security Advisory: osbuild-composer security update

Which CVE IDs does RHSA-2026:27856 cover?

RHSA-2026:27856 covers the following CVE IDs: CVE-2026-33186, CVE-2026-34986. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2026:27856?

RHSA-2026:27856 has a CVSS v3 base score of 9.1, published by Red Hat Product Security.

RHSA-2026:27856HighCVSS 9.1

Red Hat Security Advisory: osbuild-composer security update

Vendor

Red Hat Product Security

Published

June 22, 2026

Last Modified

July 6, 2026

🔗 CVE IDs covered (2)

CVE-2026-33186 →CVE-2026-34986 →

📋 Description

CVE-2026-33186 — google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation CVE-2026-34986 — github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object

🔗 References (5)

selfhttps://access.redhat.com/errata/RHSA-2026:27856
externalhttps://access.redhat.com/security/updates/classification/#important
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2449833
externalhttps://bugzilla.redhat.com/show_bug.cgi?id=2455470
selfhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_27856.json