Issued at: 2026-09-24
Updated at: 2026-09-24
Advisory content derived from Red Hat RHSA-2026:70640, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: buildah security update
Description
The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images.
Security Fix(es):
* buildah: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
* buildah: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)
* buildah: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* buildah: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* buildah: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
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.