RHEL 8 : osbuild-composer (RHSA-2026:96076)

critical Nessus Plugin ID 377584

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-2026:96076 advisory.

An image building service based on osbuild It is inspired by lorax-composer and exposes the same API. As such, it is a drop-in replacement.

Security Fix(es):

* crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121)

* crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)

* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)

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

* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)

* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)

* github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy (CVE-2026-55677)

* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)

* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)

* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)

* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)

* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)

* encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)

* net/http: golang: golang: Denial of Service via crafted HTTP Range headers (CVE-2026-78667)

* crypto/tls: golang: crypto/tls: Denial of Service via multiple ECH outer extension references (CVE-2026-97031)

* net/textproto: mime/multipart: golang: golang: Denial of Service via memory limit bypass in multipart form parsing (CVE-2026-94440)

* net/http: net/http/internal/http2: golang.org/x/net/http2: net/http: Denial of Service via excessive HTTP/2 SETTINGS frames (CVE-2026-78669)

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-2026:96076.

Plugin Details

Severity: Critical

ID: 377584

File Name: redhat-RHSA-2026-96076.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

Percentile: 95.86

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2025-68121

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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_aus:8.4, 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: 11/9/2026

Vulnerability Publication Date: 1/22/2026

Reference Information

CVE: CVE-2025-68121, CVE-2026-32280, CVE-2026-32281, CVE-2026-33810, CVE-2026-33818, CVE-2026-39821, CVE-2026-42504, CVE-2026-55677, CVE-2026-56853, CVE-2026-56858, CVE-2026-56859, CVE-2026-56860, CVE-2026-56862, CVE-2026-78667, CVE-2026-78669, CVE-2026-94440, CVE-2026-97031

CWE: 1050, 1289, 22, 295, 770, 776, 79

RHSA: 2026:96076

Detections

Analytics