RLSA-2026:65895

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Source
https://errata.rockylinux.org/RLSA-2026:65895
Import Source
https://storage.googleapis.com/resf-osv-data/RLSA-2026:65895.json
JSON Data
https://api.osv.dev/v1/vulns/RLSA-2026:65895
Upstream
  • CVE-2026-33818
  • CVE-2026-42504
  • CVE-2026-56853
  • CVE-2026-56858
  • CVE-2026-56859
  • CVE-2026-56860
  • CVE-2026-56862
Published
2026-09-10T00:09:11Z
Modified
2026-09-10T00:30:02Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L CVSS Calculator
Summary
Important: osbuild-composer security update
Details

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):

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

  • net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)

  • net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)

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

  • 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)

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.

Database specific 
{
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:65895"
}
References
Credits
    • Rocky Enterprise Software Foundation
    • Red Hat

Affected packages

Rocky Linux:10 / osbuild-composer

Package

Name
osbuild-composer
Purl
pkg:rpm/rocky-linux/osbuild-composer?distro=rocky-linux-10&epoch=0

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0:165.1-3.el10_2.2.rocky.0.1
Database specific
Show details 
{
    "yum_repository": "AppStream"
}

Database specific

source 
"https://storage.googleapis.com/resf-osv-data/RLSA-2026:65895.json"