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RHEL 8 : osbuild-composer (RHSA-2026:48790)

medium Nessus Plugin ID 331507

Synopsis

The remote Red Hat host is missing one or more security updates for osbuild-composer.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:48790 advisory.

 A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients.

 Security Fix(es):

 * google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186)

 * 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 (CVE-2026-34986)

 * golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)

 * crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283)

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

 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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL osbuild-composer package based on the guidance in RHSA-2026:48790.

See Also

https://access.redhat.com/errata/RHSA-2026:48790

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2449833

https://bugzilla.redhat.com/show_bug.cgi?id=2455470

https://bugzilla.redhat.com/show_bug.cgi?id=2456336

https://bugzilla.redhat.com/show_bug.cgi?id=2456338

https://bugzilla.redhat.com/show_bug.cgi?id=2456339

http://www.nessus.org/u?244a4a84

Plugin Details

Severity: Medium

ID: 331507

File Name: redhat-RHSA-2026-48790.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/31/2026

Updated: 7/31/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

Percentile: 96.81

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 4.6

Vector: CVSS2#AV:L/AC:H/Au:M/C:C/I:C/A:C

CVSS Score Source: CVE-2026-32282

CVSS v3

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:rhel_eus:8.10, p-cpe:/a:redhat:enterprise_linux:osbuild-composer-core, p-cpe:/a:redhat:enterprise_linux:osbuild-composer-worker, p-cpe:/a:redhat:enterprise_linux:osbuild-composer

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/31/2026

Vulnerability Publication Date: 3/18/2026

Reference Information

CVE: CVE-2026-32280, CVE-2026-32282, CVE-2026-32283, CVE-2026-33186, CVE-2026-34986

CWE: 131, 367, 551, 764, 770

RHSA: 2026:48790